diff --git a/mysql-test/suite/tianmu/r/drop_index.result b/mysql-test/suite/tianmu/r/drop_index.result
new file mode 100644
index 000000000..ced3ddefc
--- /dev/null
+++ b/mysql-test/suite/tianmu/r/drop_index.result
@@ -0,0 +1,40 @@
+DROP DATABASE IF EXISTS drop_index_test;
+CREATE DATABASE drop_index_test;
+USE drop_index_test;
+CREATE TABLE t1 (
+id int(11) DEFAULT NULL,
+name varchar(10) DEFAULT NULL,
+UNIQUE KEY idx_id (id)
+) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4;
+CREATE TABLE t2 (
+`id` int(11) NOT NULL,
+`name` text,
+PRIMARY KEY (`id`),
+FULLTEXT KEY `idx_name` (`name`)
+) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4;
+CREATE TABLE `t3` (
+`id` int(11) NOT NULL AUTO_INCREMENT,
+`first_name` varchar(10) NOT NULL,
+`last_name` text NOT NULL,
+`sex` varchar(5) NOT NULL,
+`score` int(11) NOT NULL,
+`copy_id` int(11) NOT NULL,
+PRIMARY KEY (`id`),
+UNIQUE KEY `idx_uk` (`copy_id`),
+KEY `idx_firstname` (`first_name`),
+FULLTEXT KEY `idx_lastname` (`last_name`)
+) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4;
+set session sql_mode='STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
+Warnings:
+Warning	3135	'NO_ZERO_DATE', 'NO_ZERO_IN_DATE' and 'ERROR_FOR_DIVISION_BY_ZERO' sql modes should be used with strict mode. They will be merged with strict mode in a future release.
+drop index idx_id on t1;
+ERROR HY000: Tianmu engine does not support unique index.
+drop index idx_name on t2;
+ERROR HY000: Tianmu engine does not support fulltext index.
+drop index idx_firstname on t3;
+ERROR HY000: Tianmu engine does not support secondary index.
+drop index idx_lastname on t3;
+ERROR HY000: Tianmu engine does not support fulltext index.
+drop index idx_uk on t3;
+ERROR HY000: Tianmu engine does not support unique index.
+DROP DATABASE drop_index_test;
diff --git a/mysql-test/suite/tianmu/t/drop_index-master.opt b/mysql-test/suite/tianmu/t/drop_index-master.opt
new file mode 100644
index 000000000..4494579d7
--- /dev/null
+++ b/mysql-test/suite/tianmu/t/drop_index-master.opt
@@ -0,0 +1 @@
+--sql_mode=NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,NO_KEY_ERROR
diff --git a/mysql-test/suite/tianmu/t/drop_index.test b/mysql-test/suite/tianmu/t/drop_index.test
new file mode 100644
index 000000000..6ad7b74e3
--- /dev/null
+++ b/mysql-test/suite/tianmu/t/drop_index.test
@@ -0,0 +1,54 @@
+--source include/have_tianmu.inc
+
+--disable_warnings
+DROP DATABASE IF EXISTS drop_index_test;
+--enable_warnings
+
+CREATE DATABASE drop_index_test;
+
+USE drop_index_test;
+
+CREATE TABLE t1 (
+  id int(11) DEFAULT NULL,
+  name varchar(10) DEFAULT NULL,
+  UNIQUE KEY idx_id (id)
+  ) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE t2 (
+  `id` int(11) NOT NULL,
+  `name` text,
+  PRIMARY KEY (`id`),
+  FULLTEXT KEY `idx_name` (`name`)
+) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE `t3` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `first_name` varchar(10) NOT NULL,
+  `last_name` text NOT NULL,
+  `sex` varchar(5) NOT NULL,
+  `score` int(11) NOT NULL,
+  `copy_id` int(11) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `idx_uk` (`copy_id`),
+  KEY `idx_firstname` (`first_name`),
+  FULLTEXT KEY `idx_lastname` (`last_name`)
+) ENGINE=TIANMU DEFAULT CHARSET=utf8mb4;
+
+set session sql_mode='STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
+
+--error ER_TIANMU_NOT_SUPPORTED_UNIQUE_INDEX 
+drop index idx_id on t1;
+
+--error ER_TIANMU_NOT_SUPPORTED_FULLTEXT_INDEX 
+drop index idx_name on t2;
+
+--error ER_TIANMU_NOT_SUPPORTED_SECONDARY_INDEX
+drop index idx_firstname on t3;
+
+--error ER_TIANMU_NOT_SUPPORTED_FULLTEXT_INDEX 
+drop index idx_lastname on t3;
+
+--error ER_TIANMU_NOT_SUPPORTED_UNIQUE_INDEX 
+drop index idx_uk on t3;
+
+DROP DATABASE drop_index_test;
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index 0bf416a39..db9000529 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -3933,7 +3933,6 @@ mysql_prepare_create_table(THD *thd, const char *error_schema_name,
     }
     (*key_count)++;
     tmp=file->max_key_parts();
-
     sql_mode_t sql_mode = thd->slave_thread ? global_system_variables.sql_mode : thd->variables.sql_mode;
     if ((create_info->db_type->db_type == DB_TYPE_TIANMU)) {
       if ((file->ha_table_flags() & HA_NON_SECONDARY_KEY) &&
@@ -8316,8 +8315,36 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
     while ((drop=drop_it++))
     {
       if (drop->type == Alter_drop::KEY &&
-	  !my_strcasecmp(system_charset_info,key_name, drop->name))
-	break;
+	  !my_strcasecmp(system_charset_info,key_name, drop->name)) {
+      // for issue 1342 and 1343, if sql_mode does not contains NO_KEY_ERROR, 
+      // drop unique key, sencondary index, and fulltext index will return an error.
+      sql_mode_t sql_mode = thd->slave_thread ? global_system_variables.sql_mode : thd->variables.sql_mode;
+      if ((create_info->db_type->db_type == DB_TYPE_TIANMU) &&
+            !(sql_mode & MODE_NO_KEY_ERROR)) {
+        if (key_info->flags & HA_SPATIAL){
+          //key_type= KEYTYPE_SPATIAL; 
+          //do nothing
+        } else if (key_info->flags & HA_NOSAME) {
+          if (! my_strcasecmp(system_charset_info, key_name, primary_key_name)) {
+            //key_type= KEYTYPE_PRIMARY;
+            //do nothing
+          } else {
+            //key_type= KEYTYPE_UNIQUE;
+            my_error(ER_TIANMU_NOT_SUPPORTED_UNIQUE_INDEX, MYF(0));
+            goto err;
+          }
+        } else if (key_info->flags & HA_FULLTEXT) {
+          //key_type= KEYTYPE_FULLTEXT;
+          my_error(ER_TIANMU_NOT_SUPPORTED_FULLTEXT_INDEX, MYF(0));
+          goto err; 
+        } else {
+          //key_type= KEYTYPE_MULTIPLE;
+          my_error(ER_TIANMU_NOT_SUPPORTED_SECONDARY_INDEX, MYF(0));
+          goto err; 
+        }
+      }
+      break;
+    }
     }
     if (drop)
     {