diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/ShardingDataSource.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/ShardingDataSource.java
index 45ee1ba86ff74..b932780fb0971 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/ShardingDataSource.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/ShardingDataSource.java
@@ -18,19 +18,20 @@
 package com.dangdang.ddframe.rdb.sharding.api;
 
 import java.sql.Connection;
-import java.sql.DatabaseMetaData;
 import java.sql.SQLException;
 import java.util.Properties;
 
-import javax.sql.DataSource;
-
 import com.dangdang.ddframe.rdb.sharding.api.config.ShardingConfiguration;
 import com.dangdang.ddframe.rdb.sharding.api.config.ShardingConfigurationConstant;
 import com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule;
 import com.dangdang.ddframe.rdb.sharding.exception.ShardingJdbcException;
+import com.dangdang.ddframe.rdb.sharding.executor.ExecutorEngine;
 import com.dangdang.ddframe.rdb.sharding.jdbc.ShardingConnection;
+import com.dangdang.ddframe.rdb.sharding.jdbc.ShardingContext;
 import com.dangdang.ddframe.rdb.sharding.jdbc.adapter.AbstractDataSourceAdapter;
 import com.dangdang.ddframe.rdb.sharding.metrics.MetricsContext;
+import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
+import com.dangdang.ddframe.rdb.sharding.threadlocal.ThreadLocalObjectRepository;
 import com.google.common.base.Preconditions;
 
 /**
@@ -40,51 +41,40 @@
  */
 public class ShardingDataSource extends AbstractDataSourceAdapter {
     
-    private final ShardingRule shardingRule;
-    
-    private final DatabaseMetaData databaseMetaData;
+    private final ThreadLocalObjectRepository threadLocalObjectRepository = new ThreadLocalObjectRepository();
     
-    private final ShardingConfiguration configuration;
-    
-    private final MetricsContext metricsContext;
+    private final ShardingContext context;
     
     public ShardingDataSource(final ShardingRule shardingRule) {
         this(shardingRule, new Properties());
     }
     
     public ShardingDataSource(final ShardingRule shardingRule, final Properties props) {
-        this.shardingRule = shardingRule;
-        databaseMetaData = getDatabaseMetaData();
-        configuration = new ShardingConfiguration(props);
-        metricsContext = new MetricsContext(configuration.getConfig(ShardingConfigurationConstant.METRICS_ENABLE, boolean.class), 
-                configuration.getConfig(ShardingConfigurationConstant.METRICS_SECOND_PERIOD, long.class), 
-                configuration.getConfig(ShardingConfigurationConstant.METRICS_PACKAGE_NAME, String.class));
+        Preconditions.checkNotNull(shardingRule);
+        Preconditions.checkNotNull(props);
+        ShardingConfiguration configuration = new ShardingConfiguration(props);
+        initThreadLocalObjectRepository(configuration);
+        DatabaseType type;
+        try {
+            type = DatabaseType.valueFrom(ShardingConnection.getDatabaseMetaDataFromDataSource(shardingRule.getDataSourceRule().getDataSources()).getDatabaseProductName());
+        } catch (final SQLException e) {
+            throw new ShardingJdbcException("Can not get database product name", e);
+        }
+        context = new ShardingContext(shardingRule, new SQLRouteEngine(shardingRule, type), new ExecutorEngine(configuration));
     }
     
-    private DatabaseMetaData getDatabaseMetaData() {
-        String databaseProductName = null;
-        DatabaseMetaData result = null;
-        for (DataSource each : shardingRule.getDataSourceRule().getDataSources()) {
-            String databaseProductNameInEach;
-            DatabaseMetaData metaDataInEach;
-            try {
-                metaDataInEach = each.getConnection().getMetaData();
-                databaseProductNameInEach = metaDataInEach.getDatabaseProductName();
-            } catch (final SQLException ex) {
-                throw new ShardingJdbcException("Can not get data source DatabaseProductName", ex);
-            }
-            Preconditions.checkState(null == databaseProductName || databaseProductName.equals(databaseProductNameInEach), 
-                    String.format("Database type inconsistent with '%s' and '%s'", databaseProductName, databaseProductNameInEach));
-            databaseProductName = databaseProductNameInEach;
-            result = metaDataInEach;
+    private void initThreadLocalObjectRepository(final ShardingConfiguration configuration) {
+        boolean enableMetrics = configuration.getConfig(ShardingConfigurationConstant.METRICS_ENABLE, boolean.class);
+        if (enableMetrics) {
+            threadLocalObjectRepository.addItem(new MetricsContext(configuration.getConfig(ShardingConfigurationConstant.METRICS_SECOND_PERIOD, long.class),
+                    configuration.getConfig(ShardingConfigurationConstant.METRICS_PACKAGE_NAME, String.class)));
         }
-        return result;
     }
     
     @Override
     public ShardingConnection getConnection() throws SQLException {
-        metricsContext.register();
-        return new ShardingConnection(shardingRule, databaseMetaData);
+        threadLocalObjectRepository.open();
+        return new ShardingConnection(context);
     }
     
     @Override
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/config/ShardingConfigurationConstant.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/config/ShardingConfigurationConstant.java
index d037e8b7e4b3d..97b30952bdd42 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/config/ShardingConfigurationConstant.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/api/config/ShardingConfigurationConstant.java
@@ -17,6 +17,8 @@
 
 package com.dangdang.ddframe.rdb.sharding.api.config;
 
+import java.util.concurrent.TimeUnit;
+
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
@@ -45,9 +47,33 @@ public enum ShardingConfigurationConstant {
     /**
      * 度量输出在日志中的标识名称.
      */
-    METRICS_PACKAGE_NAME("metrics.package.name", "com.dangdang.ddframe.rdb.sharding.metrics");
+    METRICS_PACKAGE_NAME("metrics.package.name", "com.dangdang.ddframe.rdb.sharding.metrics"),
+    
+    /**
+     * 最小空闲工作现成数量.
+     */
+    PARALLEL_EXECUTOR_WORKER_MIN_IDLE_SIZE("parallelExecutor.worker.minIdleSize", "0"),
+    
+    /**
+     * 最大工作现成数量.
+     */
+    PARALLEL_EXECUTOR_WORKER_MAX_SIZE("parallelExecutor.worker.maxSize", defaultMaxThread()),
+    
+    /**
+     * 工作线程空闲时超时时间.
+     */
+    PARALLEL_EXECUTOR_WORKER_MAX_IDLE_TIMEOUT("parallelExecutor.worker.maxIdleTimeout", "60"),
+    
+    /**
+     * 工作线程空闲时超时时间单位.
+     */
+    PARALLEL_EXECUTOR_WORKER_MAX_IDLE_TIMEOUT_TIME_UNIT("parallelExecutor.worker.maxIdleTimeout.timeUnit", TimeUnit.SECONDS.toString());
     
     private final String key;
     
     private final String defaultValue;
+    
+    private static String defaultMaxThread() {
+        return String.valueOf(Runtime.getRuntime().availableProcessors() * 2);
+    }
 }
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/exception/ShardingJdbcException.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/exception/ShardingJdbcException.java
index e8c0b1c9b0284..a6bb8c1262ed8 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/exception/ShardingJdbcException.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/exception/ShardingJdbcException.java
@@ -31,7 +31,7 @@ public ShardingJdbcException(final String errorMessage, final Object... args) {
     }
 
     public ShardingJdbcException(final String message, final Exception cause) {
-        super(message,cause);
+        super(message, cause);
     }
     
     public ShardingJdbcException(final Exception cause) {
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/ExecutorEngine.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/ExecutorEngine.java
index 1defea8912904..2e648cc35dfe6 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/ExecutorEngine.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/ExecutorEngine.java
@@ -23,17 +23,18 @@
 import java.util.Set;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
-import java.util.concurrent.Executors;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
 
+import com.dangdang.ddframe.rdb.sharding.api.config.ShardingConfiguration;
+import com.dangdang.ddframe.rdb.sharding.api.config.ShardingConfigurationConstant;
 import com.dangdang.ddframe.rdb.sharding.exception.ShardingJdbcException;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.ListeningExecutorService;
 import com.google.common.util.concurrent.MoreExecutors;
-
-import lombok.AccessLevel;
-import lombok.NoArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 /**
@@ -41,10 +42,20 @@
  * 
  * @author gaohongtao
  */
-@NoArgsConstructor(access = AccessLevel.PRIVATE)
 @Slf4j
 public final class ExecutorEngine {
     
+    private final ListeningExecutorService executorService;
+    
+    public ExecutorEngine(final ShardingConfiguration configuration) {
+        executorService = MoreExecutors.listeningDecorator(MoreExecutors.getExitingExecutorService(
+                new ThreadPoolExecutor(configuration.getConfig(ShardingConfigurationConstant.PARALLEL_EXECUTOR_WORKER_MIN_IDLE_SIZE, int.class),
+                configuration.getConfig(ShardingConfigurationConstant.PARALLEL_EXECUTOR_WORKER_MAX_SIZE, int.class),
+                configuration.getConfig(ShardingConfigurationConstant.PARALLEL_EXECUTOR_WORKER_MAX_IDLE_TIMEOUT, long.class),
+                TimeUnit.valueOf(configuration.getConfig(ShardingConfigurationConstant.PARALLEL_EXECUTOR_WORKER_MAX_IDLE_TIMEOUT_TIME_UNIT)),
+                new LinkedBlockingQueue<Runnable>())));
+    }
+    
     /**
      * 多线程执行任务.
      * 
@@ -54,7 +65,7 @@ public final class ExecutorEngine {
      * @param <O> 出参类型
      * @return 执行结果
      */
-    public static <I, O> List<O> execute(final Collection<I> inputs, final ExecuteUnit<I, O> executeUnit) {
+    public <I, O> List<O> execute(final Collection<I> inputs, final ExecuteUnit<I, O> executeUnit) {
         ListenableFuture<List<O>> futures = submitFutures(inputs, executeUnit);
         addCallback(futures);
         return getFutureResults(futures);
@@ -71,15 +82,14 @@ public static <I, O> List<O> execute(final Collection<I> inputs, final ExecuteUn
      * @param <O> 最终结果类型
      * @return 执行结果
      */
-    public static <I, M, O> O execute(final Collection<I> inputs, final ExecuteUnit<I, M> executeUnit, final MergeUnit<M, O> mergeUnit) {
+    public <I, M, O> O execute(final Collection<I> inputs, final ExecuteUnit<I, M> executeUnit, final MergeUnit<M, O> mergeUnit) {
         return mergeUnit.merge(execute(inputs, executeUnit));
     }
     
-    private static <I, O> ListenableFuture<List<O>> submitFutures(final Collection<I> inputs, final ExecuteUnit<I, O> executeUnit) {
+    private <I, O> ListenableFuture<List<O>> submitFutures(final Collection<I> inputs, final ExecuteUnit<I, O> executeUnit) {
         Set<ListenableFuture<O>> result = new HashSet<>(inputs.size());
-        ListeningExecutorService service = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(inputs.size()));
         for (final I each : inputs) {
-            result.add(service.submit(new Callable<O>() {
+            result.add(executorService.submit(new Callable<O>() {
                 
                 @Override
                 public O call() throws Exception {
@@ -87,13 +97,11 @@ public O call() throws Exception {
                 }
             }));
         }
-        service.shutdown();
         return Futures.allAsList(result);
     }
     
-    private static <T> void addCallback(final ListenableFuture<T> allFutures) {
+    private <T> void addCallback(final ListenableFuture<T> allFutures) {
         Futures.addCallback(allFutures, new FutureCallback<T>() {
-            
             @Override
             public void onSuccess(final T result) {
                 log.trace("Concurrent execute result success {}", result);
@@ -106,7 +114,7 @@ public void onFailure(final Throwable thrown) {
         });
     }
     
-    private static <O> O getFutureResults(final ListenableFuture<O> futures) {
+    private <O> O getFutureResults(final ListenableFuture<O> futures) {
         try {
             return futures.get();
         } catch (final InterruptedException | ExecutionException ex) {
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/PreparedStatementExecutor.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/PreparedStatementExecutor.java
index 52ed3dce08c8f..af4758a2918df 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/PreparedStatementExecutor.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/PreparedStatementExecutor.java
@@ -26,7 +26,6 @@
 
 import com.codahale.metrics.Timer.Context;
 import com.dangdang.ddframe.rdb.sharding.metrics.MetricsContext;
-
 import lombok.RequiredArgsConstructor;
 
 /**
@@ -37,6 +36,8 @@
 @RequiredArgsConstructor
 public final class PreparedStatementExecutor {
     
+    private final ExecutorEngine executorEngine;
+    
     private final Collection<PreparedStatement> preparedStatements;
     
     /**
@@ -53,7 +54,7 @@ public List<ResultSet> executeQuery() throws SQLException {
             MetricsContext.stop(context);
             return result;
         }
-        result = ExecutorEngine.execute(preparedStatements, new ExecuteUnit<PreparedStatement, ResultSet>() {
+        result = executorEngine.execute(preparedStatements, new ExecuteUnit<PreparedStatement, ResultSet>() {
             
             @Override
             public ResultSet execute(final PreparedStatement input) throws Exception {
@@ -78,7 +79,7 @@ public int executeUpdate() throws SQLException {
             MetricsContext.stop(context);
             return result;
         }
-        result = ExecutorEngine.execute(preparedStatements, new ExecuteUnit<PreparedStatement, Integer>() {
+        result = executorEngine.execute(preparedStatements, new ExecuteUnit<PreparedStatement, Integer>() {
             
             @Override
             public Integer execute(final PreparedStatement input) throws Exception {
@@ -112,7 +113,7 @@ public boolean execute() throws SQLException {
             MetricsContext.stop(context);
             return result;
         }
-        List<Boolean> result = ExecutorEngine.execute(preparedStatements, new ExecuteUnit<PreparedStatement, Boolean>() {
+        List<Boolean> result = executorEngine.execute(preparedStatements, new ExecuteUnit<PreparedStatement, Boolean>() {
             
             @Override
             public Boolean execute(final PreparedStatement input) throws Exception {
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/StatementExecutor.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/StatementExecutor.java
index 2a25040695353..43d1a9ed14a6b 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/StatementExecutor.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/executor/StatementExecutor.java
@@ -27,7 +27,6 @@
 
 import com.codahale.metrics.Timer.Context;
 import com.dangdang.ddframe.rdb.sharding.metrics.MetricsContext;
-
 import lombok.RequiredArgsConstructor;
 
 /**
@@ -38,6 +37,8 @@
 @RequiredArgsConstructor
 public final class StatementExecutor {
     
+    private final ExecutorEngine executorEngine;
+    
     private final Collection<StatementEntity> statements = new ArrayList<>();
     
     /**
@@ -65,7 +66,7 @@ public List<ResultSet> executeQuery() throws SQLException {
             MetricsContext.stop(context);
             return result;
         }
-        result = ExecutorEngine.execute(statements, new ExecuteUnit<StatementEntity, ResultSet>() {
+        result = executorEngine.execute(statements, new ExecuteUnit<StatementEntity, ResultSet>() {
             
             @Override
             public ResultSet execute(final StatementEntity input) throws Exception {
@@ -131,7 +132,7 @@ private int executeUpdate(final Updater updater) throws SQLException {
             MetricsContext.stop(context);
             return result;
         }
-        result = ExecutorEngine.execute(statements, new ExecuteUnit<StatementEntity, Integer>() {
+        result = executorEngine.execute(statements, new ExecuteUnit<StatementEntity, Integer>() {
             
             @Override
             public Integer execute(final StatementEntity input) throws Exception {
@@ -206,7 +207,7 @@ private boolean execute(final Executor executor) throws SQLException {
             MetricsContext.stop(context);
             return result;
         }
-        List<Boolean> result = ExecutorEngine.execute(statements, new ExecuteUnit<StatementEntity, Boolean>() {
+        List<Boolean> result = executorEngine.execute(statements, new ExecuteUnit<StatementEntity, Boolean>() {
             
             @Override
             public Boolean execute(final StatementEntity input) throws Exception {
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingConnection.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingConnection.java
index a7c0ffff21831..523684b446404 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingConnection.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingConnection.java
@@ -25,35 +25,32 @@
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
+import javax.sql.DataSource;
 
 import com.codahale.metrics.Timer.Context;
-import com.dangdang.ddframe.rdb.sharding.api.DatabaseType;
-import com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule;
+import com.dangdang.ddframe.rdb.sharding.exception.ShardingJdbcException;
 import com.dangdang.ddframe.rdb.sharding.jdbc.adapter.AbstractConnectionAdapter;
 import com.dangdang.ddframe.rdb.sharding.metrics.MetricsContext;
-import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
+import com.google.common.base.Function;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Collections2;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
 
 /**
  * 支持分片的数据库连接.
  * 
- * @author zhangliang
+ * @author zhangliang,gaohongtao
  */
+@RequiredArgsConstructor
 public final class ShardingConnection extends AbstractConnectionAdapter {
     
-    private final ShardingRule shardingRule;
-    
-    private final DatabaseMetaData metaData;
+    @Getter(AccessLevel.PACKAGE)
+    private final ShardingContext context;
     
     private Map<String, Connection> connectionMap = new HashMap<>();
     
-    private SQLRouteEngine sqlRouteEngine;
-    
-    public ShardingConnection(final ShardingRule shardingRule, final DatabaseMetaData metaData) throws SQLException {
-        this.shardingRule = shardingRule;
-        this.metaData = metaData;
-        sqlRouteEngine = new SQLRouteEngine(shardingRule, DatabaseType.valueFrom(metaData.getDatabaseProductName()));
-    }
-    
     /**
      * 根据数据源名称获取相应的数据库连接.
      * 
@@ -65,7 +62,7 @@ public Connection getConnection(final String dataSourceName) throws SQLException
             return connectionMap.get(dataSourceName);
         }
         Context context = MetricsContext.start("ShardingConnection-getConnection", dataSourceName);
-        Connection connection = shardingRule.getDataSourceRule().getDataSource(dataSourceName).getConnection();
+        Connection connection = this.context.getShardingRule().getDataSourceRule().getDataSource(dataSourceName).getConnection();
         MetricsContext.stop(context);
         replayMethodsInvovation(connection);
         connectionMap.put(dataSourceName, connection);
@@ -74,52 +71,104 @@ public Connection getConnection(final String dataSourceName) throws SQLException
     
     @Override
     public DatabaseMetaData getMetaData() throws SQLException {
-        return metaData;
+        if (connectionMap.isEmpty()) {
+            return getDatabaseMetaDataFromDataSource(context.getShardingRule().getDataSourceRule().getDataSources());
+        } else {
+            return getDatabaseMetaDataFromConnection(connectionMap.values());
+        }
+    }
+    
+    public static DatabaseMetaData getDatabaseMetaDataFromDataSource(final Collection<DataSource> dataSources) {
+        Collection<Connection> connectionCollection = null;
+        
+        try {
+            connectionCollection = Collections2.transform(dataSources, new Function<DataSource, Connection>() {
+                
+                @Override
+                public Connection apply(final DataSource input) {
+                    try {
+                        return input.getConnection();
+                    } catch (final SQLException e) {
+                        throw new ShardingJdbcException(e);
+                    }
+                }
+            });
+            return getDatabaseMetaDataFromConnection(connectionCollection);
+        } finally {
+            if (null != connectionCollection) {
+                for (Connection each : connectionCollection) {
+                    try {
+                        each.close();
+                    } catch (final SQLException ignored) {
+                    }
+                }
+            }
+        }
+    }
+    
+    private static DatabaseMetaData getDatabaseMetaDataFromConnection(final Collection<Connection> connections) {
+        String databaseProductName = null;
+        DatabaseMetaData result = null;
+        for (Connection each : connections) {
+            String databaseProductNameInEach;
+            DatabaseMetaData metaDataInEach;
+            try {
+                metaDataInEach = each.getMetaData();
+                databaseProductNameInEach = metaDataInEach.getDatabaseProductName();
+            } catch (final SQLException ex) {
+                throw new ShardingJdbcException("Can not get data source DatabaseProductName", ex);
+            }
+            Preconditions.checkState(null == databaseProductName || databaseProductName.equals(databaseProductNameInEach),
+                    String.format("Database type inconsistent with '%s' and '%s'", databaseProductName, databaseProductNameInEach));
+            databaseProductName = databaseProductNameInEach;
+            result = metaDataInEach;
+        }
+        return result;
     }
     
     @Override
     public PreparedStatement prepareStatement(final String sql) throws SQLException {
-        return new ShardingPreparedStatement(sqlRouteEngine, this, sql);
+        return new ShardingPreparedStatement(this, sql);
     }
     
     @Override
     public PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency) throws SQLException {
-        return new ShardingPreparedStatement(sqlRouteEngine, this, sql, resultSetType, resultSetConcurrency);
+        return new ShardingPreparedStatement(this, sql, resultSetType, resultSetConcurrency);
     }
     
     @Override
     public PreparedStatement prepareStatement(final String sql, final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
-        return new ShardingPreparedStatement(sqlRouteEngine, this, sql, resultSetType, resultSetConcurrency, resultSetHoldability);
+        return new ShardingPreparedStatement(this, sql, resultSetType, resultSetConcurrency, resultSetHoldability);
     }
     
     @Override
     public PreparedStatement prepareStatement(final String sql, final int autoGeneratedKeys) throws SQLException {
-        return new ShardingPreparedStatement(sqlRouteEngine, this, sql, autoGeneratedKeys);
+        return new ShardingPreparedStatement(this, sql, autoGeneratedKeys);
     }
     
     @Override
     public PreparedStatement prepareStatement(final String sql, final int[] columnIndexes) throws SQLException {
-        return new ShardingPreparedStatement(sqlRouteEngine, this, sql, columnIndexes);
+        return new ShardingPreparedStatement(this, sql, columnIndexes);
     }
     
     @Override
     public PreparedStatement prepareStatement(final String sql, final String[] columnNames) throws SQLException {
-        return new ShardingPreparedStatement(sqlRouteEngine, this, sql, columnNames);
+        return new ShardingPreparedStatement(this, sql, columnNames);
     }
     
     @Override
     public Statement createStatement() throws SQLException {
-        return new ShardingStatement(sqlRouteEngine, this);
+        return new ShardingStatement(this);
     }
     
     @Override
     public Statement createStatement(final int resultSetType, final int resultSetConcurrency) throws SQLException {
-        return new ShardingStatement(sqlRouteEngine, this, resultSetType, resultSetConcurrency);
+        return new ShardingStatement(this, resultSetType, resultSetConcurrency);
     }
     
     @Override
     public Statement createStatement(final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
-        return new ShardingStatement(sqlRouteEngine, this, resultSetType, resultSetConcurrency, resultSetHoldability);
+        return new ShardingStatement(this, resultSetType, resultSetConcurrency, resultSetHoldability);
     }
     
     @Override
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingContext.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingContext.java
new file mode 100644
index 0000000000000..37d03e8c659fe
--- /dev/null
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingContext.java
@@ -0,0 +1,40 @@
+/**
+ * Copyright 1999-2015 dangdang.com.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * </p>
+ */
+
+package com.dangdang.ddframe.rdb.sharding.jdbc;
+
+import com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule;
+import com.dangdang.ddframe.rdb.sharding.executor.ExecutorEngine;
+import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * ShardingDataSource运行期上下文.
+ * 
+ * @author gaohongtao
+ */
+@RequiredArgsConstructor
+@Getter
+public final class ShardingContext {
+    
+    private final ShardingRule shardingRule;
+    
+    private final SQLRouteEngine sqlRouteEngine;
+    
+    private final ExecutorEngine executorEngine;
+}
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingPreparedStatement.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingPreparedStatement.java
index 817790dd38413..1dd1fc4aa7a24 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingPreparedStatement.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingPreparedStatement.java
@@ -31,8 +31,8 @@
 import com.dangdang.ddframe.rdb.sharding.executor.PreparedStatementExecutor;
 import com.dangdang.ddframe.rdb.sharding.jdbc.adapter.AbstractPreparedStatementAdapter;
 import com.dangdang.ddframe.rdb.sharding.merger.ResultSetFactory;
+import com.dangdang.ddframe.rdb.sharding.parser.result.merger.MergeContext;
 import com.dangdang.ddframe.rdb.sharding.router.SQLExecutionUnit;
-import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
 import com.dangdang.ddframe.rdb.sharding.router.SQLRouteResult;
 import com.google.common.collect.Lists;
 
@@ -57,53 +57,54 @@ public final class ShardingPreparedStatement extends AbstractPreparedStatementAd
     
     private final List<List<Object>> batchParameters = new ArrayList<>();
     
-    public ShardingPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, final String sql) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    public ShardingPreparedStatement(final ShardingConnection shardingConnection, final String sql) throws SQLException {
+        this(shardingConnection, sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
     }
     
-    public ShardingPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, 
+    public ShardingPreparedStatement(final ShardingConnection shardingConnection, 
             final String sql, final int resultSetType, final int resultSetConcurrency) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, sql, resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+        this(shardingConnection, sql, resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
     }
     
-    public ShardingPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, 
+    public ShardingPreparedStatement(final ShardingConnection shardingConnection, 
             final String sql, final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
-        super(sqlRouteEngine, shardingConnection, resultSetType, resultSetConcurrency, resultSetHoldability);
+        super(shardingConnection, resultSetType, resultSetConcurrency, resultSetHoldability);
         this.sql = sql;
     }
     
-    public ShardingPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, final String sql, final int autoGeneratedKeys) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, sql);
+    public ShardingPreparedStatement(final ShardingConnection shardingConnection, final String sql, final int autoGeneratedKeys) throws SQLException {
+        this(shardingConnection, sql);
         this.autoGeneratedKeys = autoGeneratedKeys;
     }
     
-    public ShardingPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, final String sql, final int[] columnIndexes) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, sql);
+    public ShardingPreparedStatement(final ShardingConnection shardingConnection, final String sql, final int[] columnIndexes) throws SQLException {
+        this(shardingConnection, sql);
         this.columnIndexes = columnIndexes;
     }
     
-    public ShardingPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, final String sql, final String[] columnNames) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, sql);
+    public ShardingPreparedStatement(final ShardingConnection shardingConnection, final String sql, final String[] columnNames) throws SQLException {
+        this(shardingConnection, sql);
         this.columnNames = columnNames;
     }
     
     @Override
     public ResultSet executeQuery() throws SQLException {
         hasExecuted = true;
-        setCurrentResultSet(ResultSetFactory.getResultSet(new PreparedStatementExecutor(getRoutedPreparedStatements()).executeQuery(), getMergeContext()));
+        setCurrentResultSet(ResultSetFactory.getResultSet(new PreparedStatementExecutor(getShardingConnection().getContext().getExecutorEngine(), 
+                getRoutedPreparedStatements()).executeQuery(), getMergeContext()));
         return getCurrentResultSet();
     }
     
     @Override
     public int executeUpdate() throws SQLException {
         hasExecuted = true;
-        return new PreparedStatementExecutor(getRoutedPreparedStatements()).executeUpdate();
+        return new PreparedStatementExecutor(getShardingConnection().getContext().getExecutorEngine(), getRoutedPreparedStatements()).executeUpdate();
     }
     
     @Override
     public boolean execute() throws SQLException {
         hasExecuted = true;
-        return new PreparedStatementExecutor(getRoutedPreparedStatements()).execute();
+        return new PreparedStatementExecutor(getShardingConnection().getContext().getExecutorEngine(), getRoutedPreparedStatements()).execute();
     }
     
     @Override
@@ -123,7 +124,7 @@ public int[] executeBatch() throws SQLException {
         int[] result = new int[batchParameters.size()];
         int i = 0;
         for (List<Object> each : batchParameters) {
-            result[i++] = new PreparedStatementExecutor(routeSQL(each)).executeUpdate();
+            result[i++] = new PreparedStatementExecutor(getShardingConnection().getContext().getExecutorEngine(), routeSQL(each)).executeUpdate();
         }
         return result;
     }
@@ -150,8 +151,10 @@ private void routeIfNeed() throws SQLException {
     
     private List<PreparedStatement> routeSQL(final List<Object> parameters) throws SQLException {
         List<PreparedStatement> result = new ArrayList<>();
-        SQLRouteResult sqlRouteResult = getSqlRouteEngine().route(sql, parameters);
-        setMergeContext(sqlRouteResult.getMergeContext());
+        SQLRouteResult sqlRouteResult = getShardingConnection().getContext().getSqlRouteEngine().route(sql, parameters);
+        MergeContext mergeContext = sqlRouteResult.getMergeContext();
+        mergeContext.setExecutorEngine(getShardingConnection().getContext().getExecutorEngine());
+        setMergeContext(mergeContext);
         for (SQLExecutionUnit each : sqlRouteResult.getExecutionUnits()) {
             PreparedStatement preparedStatement = generatePrepareStatement(getShardingConnection().getConnection(each.getDataSource()), each.getSql());
             replayMethodsInvovation(preparedStatement);
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingStatement.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingStatement.java
index cd62d2863e4ce..490915a6ead6d 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingStatement.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/ShardingStatement.java
@@ -33,12 +33,10 @@
 import com.dangdang.ddframe.rdb.sharding.merger.ResultSetFactory;
 import com.dangdang.ddframe.rdb.sharding.parser.result.merger.MergeContext;
 import com.dangdang.ddframe.rdb.sharding.router.SQLExecutionUnit;
-import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
 import com.dangdang.ddframe.rdb.sharding.router.SQLRouteResult;
 import com.google.common.base.Charsets;
 import com.google.common.hash.HashCode;
 import com.google.common.hash.Hashing;
-
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.Setter;
@@ -53,9 +51,6 @@ public class ShardingStatement extends AbstractStatementAdapter {
     @Getter(AccessLevel.PROTECTED)
     private final ShardingConnection shardingConnection;
     
-    @Getter(AccessLevel.PROTECTED)
-    private final SQLRouteEngine sqlRouteEngine;
-    
     @Getter
     private final int resultSetType;
     
@@ -75,19 +70,18 @@ public class ShardingStatement extends AbstractStatementAdapter {
     @Setter(AccessLevel.PROTECTED)
     private ResultSet currentResultSet;
     
-    public ShardingStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    public ShardingStatement(final ShardingConnection shardingConnection) throws SQLException {
+        this(shardingConnection, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY, ResultSet.HOLD_CURSORS_OVER_COMMIT);
     }
     
-    public ShardingStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, final int resultSetType, final int resultSetConcurrency) throws SQLException {
-        this(sqlRouteEngine, shardingConnection, resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
+    public ShardingStatement(final ShardingConnection shardingConnection, final int resultSetType, final int resultSetConcurrency) throws SQLException {
+        this(shardingConnection, resultSetType, resultSetConcurrency, ResultSet.HOLD_CURSORS_OVER_COMMIT);
     }
     
-    public ShardingStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, 
-            final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
+    public ShardingStatement(final ShardingConnection shardingConnection,
+                             final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
         super(Statement.class);
         this.shardingConnection = shardingConnection;
-        this.sqlRouteEngine = sqlRouteEngine;
         this.resultSetType = resultSetType;
         this.resultSetConcurrency = resultSetConcurrency;
         this.resultSetHoldability = resultSetHoldability;
@@ -148,9 +142,10 @@ public boolean execute(final String sql, final String[] columnNames) throws SQLE
     }
     
     private StatementExecutor generateExecutor(final String sql) throws SQLException {
-        StatementExecutor result = new StatementExecutor();
-        SQLRouteResult sqlRouteResult = sqlRouteEngine.route(sql, Collections.emptyList());
+        StatementExecutor result = new StatementExecutor(shardingConnection.getContext().getExecutorEngine());
+        SQLRouteResult sqlRouteResult = shardingConnection.getContext().getSqlRouteEngine().route(sql, Collections.emptyList());
         mergeContext = sqlRouteResult.getMergeContext();
+        mergeContext.setExecutorEngine(shardingConnection.getContext().getExecutorEngine());
         for (SQLExecutionUnit each : sqlRouteResult.getExecutionUnits()) {
             result.addStatement(each.getSql(), generateStatement(each.getSql(), each.getDataSource()));
         }
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/adapter/AbstractPreparedStatementAdapter.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/adapter/AbstractPreparedStatementAdapter.java
index f160fc963e5b6..a23a1714e1721 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/adapter/AbstractPreparedStatementAdapter.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/adapter/AbstractPreparedStatementAdapter.java
@@ -35,8 +35,6 @@
 
 import com.dangdang.ddframe.rdb.sharding.jdbc.ShardingConnection;
 import com.dangdang.ddframe.rdb.sharding.jdbc.unsupported.AbstractUnsupportedOperationPreparedStatement;
-import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
-
 import lombok.Getter;
 
 /**
@@ -53,9 +51,9 @@ public abstract class AbstractPreparedStatementAdapter extends AbstractUnsupport
     @Getter
     private final List<Object> parameters = new ArrayList<>();
     
-    public AbstractPreparedStatementAdapter(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, 
+    public AbstractPreparedStatementAdapter(final ShardingConnection shardingConnection, 
             final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
-        super(sqlRouteEngine, shardingConnection, resultSetType, resultSetConcurrency, resultSetHoldability);
+        super(shardingConnection, resultSetType, resultSetConcurrency, resultSetHoldability);
     }
     
     @Override
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/unsupported/AbstractUnsupportedOperationPreparedStatement.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/unsupported/AbstractUnsupportedOperationPreparedStatement.java
index d6581cc295827..989b439c52f9f 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/unsupported/AbstractUnsupportedOperationPreparedStatement.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/jdbc/unsupported/AbstractUnsupportedOperationPreparedStatement.java
@@ -29,7 +29,6 @@
 
 import com.dangdang.ddframe.rdb.sharding.jdbc.ShardingConnection;
 import com.dangdang.ddframe.rdb.sharding.jdbc.ShardingStatement;
-import com.dangdang.ddframe.rdb.sharding.router.SQLRouteEngine;
 
 /**
  * 声明不支持操作的预编译语句对象.
@@ -38,9 +37,9 @@
  */
 public abstract class AbstractUnsupportedOperationPreparedStatement extends ShardingStatement implements PreparedStatement {
     
-    public AbstractUnsupportedOperationPreparedStatement(final SQLRouteEngine sqlRouteEngine, final ShardingConnection shardingConnection, 
+    public AbstractUnsupportedOperationPreparedStatement(final ShardingConnection shardingConnection, 
             final int resultSetType, final int resultSetConcurrency, final int resultSetHoldability) throws SQLException {
-        super(sqlRouteEngine, shardingConnection, resultSetType, resultSetConcurrency, resultSetHoldability);
+        super(shardingConnection, resultSetType, resultSetConcurrency, resultSetHoldability);
     }
     
     @Override
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/merger/groupby/GroupByResultSet.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/merger/groupby/GroupByResultSet.java
index 9dc0bae3c87c5..edbd3360fc552 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/merger/groupby/GroupByResultSet.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/merger/groupby/GroupByResultSet.java
@@ -73,6 +73,8 @@ public final class GroupByResultSet extends AbstractShardingResultSet {
     
     private final List<String> columnLabels;
     
+    private final ExecutorEngine executorEngine;
+    
     private Iterator<GroupByValue> groupByResultIterator;
     
     @Getter(AccessLevel.PROTECTED)
@@ -86,6 +88,7 @@ public GroupByResultSet(final List<ResultSet> resultSets, final MergeContext mer
         resultSetMetaData = getResultSets().iterator().next().getMetaData();
         columnLabels = new ArrayList<>(resultSetMetaData.getColumnCount());
         fillRelatedColumnNames();
+        executorEngine = mergeContext.getExecutorEngine();
     }
     
     private void fillRelatedColumnNames() throws SQLException {
@@ -143,7 +146,7 @@ public Multimap<GroupByKey, GroupByValue> merge(final List<Map<GroupByKey, Group
                 return result;
             }
         };
-        Multimap<GroupByKey, GroupByValue> result = ExecutorEngine.execute(getResultSets(), executeUnit, mergeUnit);
+        Multimap<GroupByKey, GroupByValue> result = executorEngine.execute(getResultSets(), executeUnit, mergeUnit);
         log.trace("Mapped result: {}", result);
         return result;
     }
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContext.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContext.java
index 8ec4a59bc95c7..810a65f63dd9e 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContext.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContext.java
@@ -19,14 +19,13 @@
 
 import java.util.concurrent.TimeUnit;
 
-import org.slf4j.LoggerFactory;
-
 import com.codahale.metrics.MetricRegistry;
 import com.codahale.metrics.Slf4jReporter;
 import com.codahale.metrics.Slf4jReporter.LoggingLevel;
 import com.codahale.metrics.Timer.Context;
+import com.dangdang.ddframe.rdb.sharding.threadlocal.ThreadLocalObjectRepository;
 import com.google.common.base.Joiner;
-import com.google.common.base.Optional;
+import org.slf4j.LoggerFactory;
 
 /**
  * 度量工具上下文.
@@ -35,32 +34,18 @@
  */
 public final class MetricsContext {
     
-    private static final ThreadLocal<MetricsContext> CONTEXT = new ThreadLocal<>();
-    
-    private final Optional<MetricRegistry> metricRegistry;
-    
-    public MetricsContext(final boolean enable, final long period, final String packageName) {
-        if (enable) {
-            metricRegistry = Optional.of(new MetricRegistry());
-            Slf4jReporter reporter = Slf4jReporter.forRegistry(metricRegistry.get())
-                    .outputTo(LoggerFactory.getLogger(packageName))
-                    .convertRatesTo(TimeUnit.SECONDS)
-                    .convertDurationsTo(TimeUnit.MILLISECONDS)
-                    .withLoggingLevel(LoggingLevel.DEBUG)
-                    .build();
-            reporter.start(period, TimeUnit.SECONDS);
-        } else {
-            metricRegistry = Optional.absent();
-        }
-    }
+    private final MetricRegistry metricRegistry;
     
-    /**
-     * 注册度量上下文.
-     */
-    public void register() {
-        if (metricRegistry.isPresent() && !this.equals(CONTEXT.get())) {
-            CONTEXT.set(this);
-        }
+    public MetricsContext(final long period, final String packageName) {
+        metricRegistry = new MetricRegistry();
+        Slf4jReporter reporter = Slf4jReporter.forRegistry(metricRegistry)
+                .outputTo(LoggerFactory.getLogger(packageName))
+                .convertRatesTo(TimeUnit.SECONDS)
+                .convertDurationsTo(TimeUnit.MILLISECONDS)
+                .withLoggingLevel(LoggingLevel.DEBUG)
+                .build();
+        reporter.start(period, TimeUnit.SECONDS);
+        
     }
     
     /**
@@ -71,7 +56,8 @@ public void register() {
      * @return 计时上下文
      */
     public static Context start(final String... name) {
-        return null == CONTEXT.get() ? null : CONTEXT.get().metricRegistry.get().timer(MetricRegistry.name(Joiner.on("-").join(name))).time();
+        MetricsContext context = ThreadLocalObjectRepository.getItem(MetricsContext.class);
+        return null == context ? null : context.metricRegistry.timer(MetricRegistry.name(Joiner.on("-").join(name))).time();
     }
     
     /**
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parser/result/merger/MergeContext.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parser/result/merger/MergeContext.java
index 470473aa02889..e625f75ce58df 100644
--- a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parser/result/merger/MergeContext.java
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parser/result/merger/MergeContext.java
@@ -20,6 +20,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import com.dangdang.ddframe.rdb.sharding.executor.ExecutorEngine;
 import lombok.Getter;
 import lombok.Setter;
 import lombok.ToString;
@@ -42,6 +43,9 @@ public final class MergeContext {
     @Setter
     private Limit limit;
     
+    @Setter
+    private ExecutorEngine executorEngine;
+    
     /**
      * 获取结果集类型.
      * 
diff --git a/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/threadlocal/ThreadLocalObjectRepository.java b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/threadlocal/ThreadLocalObjectRepository.java
new file mode 100644
index 0000000000000..32cb2f54c867f
--- /dev/null
+++ b/sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/threadlocal/ThreadLocalObjectRepository.java
@@ -0,0 +1,71 @@
+/**
+ * Copyright 1999-2015 dangdang.com.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * </p>
+ */
+
+package com.dangdang.ddframe.rdb.sharding.threadlocal;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import lombok.NoArgsConstructor;
+
+/**
+ * ThreadLocal对象仓库.
+ * 多个ShardingDataSource使用static对象会造成数据污染,故使用该类来将这些对象绑定到ThreadLocal中.
+ * 
+ * @author gaohongtao
+ */
+@NoArgsConstructor
+public final class ThreadLocalObjectRepository {
+    
+    private static final ThreadLocal<Map<String, Object>> THREAD_LOCAL_REPOSITORY = new ThreadLocal<>();
+    
+    private Map<String, Object> repository = new HashMap<>();
+    
+    /**
+     * 向仓库内添加对象.
+     * 
+     * @param item 受仓库管理的对象
+     */
+    public void addItem(final Object item) {
+        repository.put(item.getClass().getName(), item);
+    }
+    
+    /**
+     * 开始使用仓库.
+     * 在本线程开始执行前要调用此方法设置线程对象状态.
+     * 
+     */
+    public void open() {
+        Map<String, Object> repositoryInThisThread = THREAD_LOCAL_REPOSITORY.get();
+        if (null != repositoryInThisThread && repositoryInThisThread.equals(repository)) {
+            return;
+        }
+        THREAD_LOCAL_REPOSITORY.remove();
+        THREAD_LOCAL_REPOSITORY.set(repository);
+    }
+    
+    /**
+     * 获取线程中对象.
+     * 
+     * @param tClass 对象类型
+     * @return 对象
+     */
+    public static <T> T getItem(final Class<T> tClass) {
+        return (T) THREAD_LOCAL_REPOSITORY.get().get(tClass.getName());
+    }
+    
+}
diff --git a/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContextTest.java b/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContextTest.java
index d4b8bd95ebe29..d979500aca192 100644
--- a/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContextTest.java
+++ b/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/metrics/MetricsContextTest.java
@@ -17,6 +17,7 @@
 
 package com.dangdang.ddframe.rdb.sharding.metrics;
 
+import com.dangdang.ddframe.rdb.sharding.threadlocal.ThreadLocalObjectRepository;
 import org.junit.Test;
 
 import com.codahale.metrics.Timer.Context;
@@ -34,8 +35,11 @@ public void assertMetricsContextDisable() {
     }
     
     private void run(final boolean enable) {
-        MetricsContext metricsContext = new MetricsContext(enable, 1000000L, "example");
-        metricsContext.register();
+        if(enable){
+            ThreadLocalObjectRepository repository = new ThreadLocalObjectRepository();
+            repository.addItem(new MetricsContext(1000000L, "example"));
+            repository.open();
+        }
         Context context = MetricsContext.start("example");
         MetricsContext.stop(context);
     }
diff --git a/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/parser/result/SQLParsedResultTest.java b/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/parser/result/SQLParsedResultTest.java
index b35a8e82c70f0..45062269d98c7 100644
--- a/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/parser/result/SQLParsedResultTest.java
+++ b/sharding-jdbc-core/src/test/java/com/dangdang/ddframe/rdb/sharding/parser/result/SQLParsedResultTest.java
@@ -42,7 +42,7 @@ public void assertToString() throws IOException {
                 + "orderByColumns=[OrderByColumn(name=Optional.of(id), index=Optional.absent(), alias=Optional.of(a), orderByType=DESC)], "
                 + "groupByColumns=[GroupByColumn(name=id, alias=d, orderByType=ASC)], "
                 + "aggregationColumns=[AggregationColumn(expression=COUNT(id), aggregationType=COUNT, alias=Optional.of(c), option=Optional.absent(), derivedColumns=[], index=-1)], "
-                + "limit=Limit(offset=0, rowCount=10)))"));
+                + "limit=Limit(offset=0, rowCount=10), executorEngine=null))"));
     }
     
     private void generateRouteContext(final RouteContext routeContext) throws IOException {
diff --git a/sharding-jdbc-doc/content/post/stress_test.md b/sharding-jdbc-doc/content/post/stress_test.md
index dfed51f303f8d..3b2dd8f10422a 100644
--- a/sharding-jdbc-doc/content/post/stress_test.md
+++ b/sharding-jdbc-doc/content/post/stress_test.md
@@ -25,7 +25,7 @@ chart = true
 | 数据表行数   | 1000万                   | 1000万                   |
 ## 网络拓扑
 
-![网络拓扑图](img/stress_test_arch.png)
+![网络拓扑图](../../img/stress_test_arch.png)
 ## 单库情况下Sharding-JDBC与JDBC性能对比
 测试结论：
 
diff --git a/sharding-jdbc-doc/content/post/user_guide.md b/sharding-jdbc-doc/content/post/user_guide.md
index 6b769e62c00df..e52c29187da22 100644
--- a/sharding-jdbc-doc/content/post/user_guide.md
+++ b/sharding-jdbc-doc/content/post/user_guide.md
@@ -225,7 +225,7 @@ public Collection<String> doBetweenSharding(final Collection<String> availableTa
 
 下面是一个余2的算法的例子，当分片键的值除以2余数就是实际表的结尾。注意注释中提供了一些算法生成SQL的结果，参数`tableNames`集合中有两个参数`t_order_0`和`t_order_1`
 ```java
- public final class ModuloDatabaseShardingAlgorithm implements SingleKeyDatabaseShardingAlgorithm<Integer> {
+ public final class ModuloTableShardingAlgorithm implements SingleKeyTableShardingAlgorithm<Integer> {
     
     /**
     *  select * from t_order from t_order where order_id = 11 
@@ -254,9 +254,9 @@ public Collection<String> doBetweenSharding(final Collection<String> availableTa
     public Collection<String> doInSharding(final Collection<String> tableNames, final ShardingValue<Integer> shardingValue) {
         Collection<String> result = new LinkedHashSet<>(tableNames.size());
         for (Integer value : shardingValue.getValues()) {
-            for (String dataSourceName : tableNames) {
-                if (dataSourceName.endsWith(value % 2 + "")) {
-                    result.add(dataSourceName);
+            for (String tableName : tableNames) {
+                if (tableName.endsWith(value % 2 + "")) {
+                    result.add(tableName);
                 }
             }
         }