diff --git a/dubbo-config/dubbo-config-api/src/main/java/com/alibaba/dubbo/config/ApplicationConfig.java b/dubbo-config/dubbo-config-api/src/main/java/com/alibaba/dubbo/config/ApplicationConfig.java
index 9238a11508c..523e005283f 100644
--- a/dubbo-config/dubbo-config-api/src/main/java/com/alibaba/dubbo/config/ApplicationConfig.java
+++ b/dubbo-config/dubbo-config-api/src/main/java/com/alibaba/dubbo/config/ApplicationConfig.java
@@ -71,10 +71,13 @@ public class ApplicationConfig extends AbstractConfig {
     // directory for saving thread dump
     private String dumpDirectory;
 
+    // whether to enable qos or not
     private Boolean qosEnable;
 
+    // the qos port to listen
     private Integer qosPort;
 
+    // should we accept foreign ip or not?
     private Boolean qosAcceptForeignIp;
 
     // customized parameters
diff --git a/dubbo-plugin/dubbo-qos/src/main/java/com/alibaba/dubbo/qos/protocol/QosProtocolWrapper.java b/dubbo-plugin/dubbo-qos/src/main/java/com/alibaba/dubbo/qos/protocol/QosProtocolWrapper.java
index 26692cc82b5..73d1f56a797 100644
--- a/dubbo-plugin/dubbo-qos/src/main/java/com/alibaba/dubbo/qos/protocol/QosProtocolWrapper.java
+++ b/dubbo-plugin/dubbo-qos/src/main/java/com/alibaba/dubbo/qos/protocol/QosProtocolWrapper.java
@@ -18,6 +18,8 @@
 
 import com.alibaba.dubbo.common.Constants;
 import com.alibaba.dubbo.common.URL;
+import com.alibaba.dubbo.common.logger.Logger;
+import com.alibaba.dubbo.common.logger.LoggerFactory;
 import com.alibaba.dubbo.qos.server.Server;
 import com.alibaba.dubbo.rpc.Exporter;
 import com.alibaba.dubbo.rpc.Invoker;
@@ -29,8 +31,12 @@
 import static com.alibaba.dubbo.common.Constants.ACCEPT_FOREIGN_IP;
 import static com.alibaba.dubbo.common.Constants.QOS_ENABLE;
 import static com.alibaba.dubbo.common.Constants.QOS_PORT;
+import static com.alibaba.dubbo.qos.common.QosConstants.DEFAULT_PORT;
 
 public class QosProtocolWrapper implements Protocol {
+
+    private final Logger logger = LoggerFactory.getLogger(QosProtocolWrapper.class);
+
     private static AtomicBoolean hasStarted = new AtomicBoolean(false);
 
     private Protocol protocol;
@@ -76,20 +82,23 @@ private void startQosServer(URL url) {
         }
 
         try {
-            boolean qosEnable = Boolean.parseBoolean(url.getParameter(QOS_ENABLE,"true"));
+            boolean qosEnable = url.getParameter(QOS_ENABLE,true);
             if (!qosEnable) {
+                logger.info("qos won't be started because it is disabled. " +
+                        "Please check dubbo.application.qos.enable is configured either in system property, " +
+                        "dubbo.properties or XML/spring boot configuration.");
                 return;
             }
 
-            int port = Integer.parseInt(url.getParameter(QOS_PORT,"22222"));
-            boolean acceptForeignIp = Boolean.parseBoolean(url.getParameter(ACCEPT_FOREIGN_IP,"true"));
+            int port = url.getParameter(QOS_PORT, DEFAULT_PORT);
+            boolean acceptForeignIp = Boolean.parseBoolean(url.getParameter(ACCEPT_FOREIGN_IP,"false"));
             Server server = com.alibaba.dubbo.qos.server.Server.getInstance();
             server.setPort(port);
             server.setAcceptForeignIp(acceptForeignIp);
             server.start();
 
         } catch (Throwable throwable) {
-            //throw new RpcException("fail to start qos server", throwable);
+            logger.warn("Fail to start qos server: ", throwable);
         }
     }
 }
diff --git a/dubbo-registry/dubbo-registry-api/src/main/java/com/alibaba/dubbo/registry/integration/RegistryProtocol.java b/dubbo-registry/dubbo-registry-api/src/main/java/com/alibaba/dubbo/registry/integration/RegistryProtocol.java
index fd414edd135..e1a59b9dbb2 100644
--- a/dubbo-registry/dubbo-registry-api/src/main/java/com/alibaba/dubbo/registry/integration/RegistryProtocol.java
+++ b/dubbo-registry/dubbo-registry-api/src/main/java/com/alibaba/dubbo/registry/integration/RegistryProtocol.java
@@ -135,26 +135,26 @@ public <T> Exporter<T> export(final Invoker<T> originInvoker) throws RpcExceptio
 
         //registry provider
         final Registry registry = getRegistry(originInvoker);
-        final URL registedProviderUrl = getRegistedProviderUrl(originInvoker);
+        final URL registeredProviderUrl = getRegisteredProviderUrl(originInvoker);
 
         //to judge to delay publish whether or not
-        boolean register = registedProviderUrl.getParameter("register", true);
+        boolean register = registeredProviderUrl.getParameter("register", true);
 
-        ProviderConsumerRegTable.registerProvider(originInvoker, registryUrl, registedProviderUrl);
+        ProviderConsumerRegTable.registerProvider(originInvoker, registryUrl, registeredProviderUrl);
 
         if (register) {
-            register(registryUrl, registedProviderUrl);
+            register(registryUrl, registeredProviderUrl);
             ProviderConsumerRegTable.getProviderWrapper(originInvoker).setReg(true);
         }
 
         // Subscribe the override data
         // FIXME When the provider subscribes, it will affect the scene : a certain JVM exposes the service and call the same service. Because the subscribed is cached key with the name of the service, it causes the subscription information to cover.
-        final URL overrideSubscribeUrl = getSubscribedOverrideUrl(registedProviderUrl);
+        final URL overrideSubscribeUrl = getSubscribedOverrideUrl(registeredProviderUrl);
         final OverrideListener overrideSubscribeListener = new OverrideListener(overrideSubscribeUrl, originInvoker);
         overrideListeners.put(overrideSubscribeUrl, overrideSubscribeListener);
         registry.subscribe(overrideSubscribeUrl, overrideSubscribeListener);
         //Ensure that a new exporter instance is returned every time export
-        return new DestroyableExporter<T>(exporter, originInvoker, overrideSubscribeUrl, registedProviderUrl);
+        return new DestroyableExporter<T>(exporter, originInvoker, overrideSubscribeUrl, registeredProviderUrl);
     }
 
     @SuppressWarnings("unchecked")
@@ -219,10 +219,10 @@ private URL getRegistryUrl(Invoker<?> originInvoker) {
      * @param originInvoker
      * @return
      */
-    private URL getRegistedProviderUrl(final Invoker<?> originInvoker) {
+    private URL getRegisteredProviderUrl(final Invoker<?> originInvoker) {
         URL providerUrl = getProviderUrl(originInvoker);
         //The address you see at the registry
-        final URL registedProviderUrl = providerUrl.removeParameters(getFilteredKeys(providerUrl))
+        return providerUrl.removeParameters(getFilteredKeys(providerUrl))
                 .removeParameter(Constants.MONITOR_KEY)
                 .removeParameter(Constants.BIND_IP_KEY)
                 .removeParameter(Constants.BIND_PORT_KEY)
@@ -230,7 +230,6 @@ private URL getRegistedProviderUrl(final Invoker<?> originInvoker) {
                 .removeParameter(QOS_PORT)
                 .removeParameter(ACCEPT_FOREIGN_IP)
                 .removeParameter(VALIDATION_KEY);
-        return registedProviderUrl;
     }
 
     private URL getSubscribedOverrideUrl(URL registedProviderUrl) {