diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index c6f0c759afac70e94e6f0727e0f2c7f773697876..1cec7e1c54e13b5998a0121f87520df3e852e6f1 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -218,18 +218,19 @@ int32_t* taosGetErrno();
 // mnode-stable
 #define TSDB_CODE_MND_STB_ALREADY_EXIST         TAOS_DEF_ERROR_CODE(0, 0x03A0)
 #define TSDB_CODE_MND_STB_NOT_EXIST             TAOS_DEF_ERROR_CODE(0, 0x03A1)
-#define TSDB_CODE_MND_TOO_MANY_STBS             TAOS_DEF_ERROR_CODE(0, 0x03A2)
-#define TSDB_CODE_MND_INVALID_STB               TAOS_DEF_ERROR_CODE(0, 0x03A3)
-#define TSDB_CODE_MND_INVALID_STB_OPTION        TAOS_DEF_ERROR_CODE(0, 0x03A4)
-#define TSDB_CODE_MND_STB_OPTION_UNCHNAGED      TAOS_DEF_ERROR_CODE(0, 0x03A5)
-#define TSDB_CODE_MND_TOO_MANY_TAGS             TAOS_DEF_ERROR_CODE(0, 0x03A6)
-#define TSDB_CODE_MND_TAG_ALREADY_EXIST         TAOS_DEF_ERROR_CODE(0, 0x03A7)
-#define TSDB_CODE_MND_TAG_NOT_EXIST             TAOS_DEF_ERROR_CODE(0, 0x03A8)
-#define TSDB_CODE_MND_TOO_MANY_COLUMNS          TAOS_DEF_ERROR_CODE(0, 0x03A9)
-#define TSDB_CODE_MND_COLUMN_ALREADY_EXIST      TAOS_DEF_ERROR_CODE(0, 0x03AA)
-#define TSDB_CODE_MND_COLUMN_NOT_EXIST          TAOS_DEF_ERROR_CODE(0, 0x03AB)
-#define TSDB_CODE_MND_INVALID_ROW_BYTES         TAOS_DEF_ERROR_CODE(0, 0x03AC)
-#define TSDB_CODE_MND_NAME_CONFLICT_WITH_TOPIC  TAOS_DEF_ERROR_CODE(0, 0x03AD)
+#define TSDB_CODE_MND_NAME_CONFLICT_WITH_TOPIC  TAOS_DEF_ERROR_CODE(0, 0x03A2)
+#define TSDB_CODE_MND_TOO_MANY_STBS             TAOS_DEF_ERROR_CODE(0, 0x03A3)
+#define TSDB_CODE_MND_INVALID_STB               TAOS_DEF_ERROR_CODE(0, 0x03A4)
+#define TSDB_CODE_MND_INVALID_STB_OPTION        TAOS_DEF_ERROR_CODE(0, 0x03A5)
+#define TSDB_CODE_MND_INVALID_STB_ALTER_OPTION  TAOS_DEF_ERROR_CODE(0, 0x03A6)
+#define TSDB_CODE_MND_STB_OPTION_UNCHNAGED      TAOS_DEF_ERROR_CODE(0, 0x03A7)
+#define TSDB_CODE_MND_INVALID_ROW_BYTES         TAOS_DEF_ERROR_CODE(0, 0x03A8)
+#define TSDB_CODE_MND_TOO_MANY_TAGS             TAOS_DEF_ERROR_CODE(0, 0x03A9)
+#define TSDB_CODE_MND_TAG_ALREADY_EXIST         TAOS_DEF_ERROR_CODE(0, 0x03AA)
+#define TSDB_CODE_MND_TAG_NOT_EXIST             TAOS_DEF_ERROR_CODE(0, 0x03AB)
+#define TSDB_CODE_MND_TOO_MANY_COLUMNS          TAOS_DEF_ERROR_CODE(0, 0x03AC)
+#define TSDB_CODE_MND_COLUMN_ALREADY_EXIST      TAOS_DEF_ERROR_CODE(0, 0x03AD)
+#define TSDB_CODE_MND_COLUMN_NOT_EXIST          TAOS_DEF_ERROR_CODE(0, 0x03AE)
 
 // mnode-func
 #define TSDB_CODE_MND_FUNC_ALREADY_EXIST        TAOS_DEF_ERROR_CODE(0, 0x03C0)
diff --git a/source/dnode/mnode/impl/src/mndStb.c b/source/dnode/mnode/impl/src/mndStb.c
index 2280d36ac346d6133da458a2691ade2c6e33c07d..e184c7e04e08d2754854b296996783ff939d299a 100644
--- a/source/dnode/mnode/impl/src/mndStb.c
+++ b/source/dnode/mnode/impl/src/mndStb.c
@@ -740,16 +740,17 @@ static int32_t mndAlterStbTagBytes(const SStbObj *pOld, SStbObj *pNew, const SSc
   }
 
   SSchema *pTag = pNew->pTags + tag;
-  if (pSchema->bytes <= pTag->bytes) {
-    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
-    return -1;
-  }
 
   if (!(pTag->type == TSDB_DATA_TYPE_BINARY || pTag->type == TSDB_DATA_TYPE_NCHAR)) {
     terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
     return -1;
   }
 
+  if (pSchema->bytes <= pTag->bytes) {
+    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
+    return -1;
+  }
+
   pTag->bytes = pSchema->bytes;
   pNew->version++;
 
@@ -765,12 +766,12 @@ static int32_t mndAddSuperTableColumn(const SStbObj *pOld, SStbObj *pNew, const
 
   for (int32_t i = 0; i < ncols; i++) {
     if (mndFindSuperTableColumnIndex(pOld, pSchemas[i].name) > 0) {
-      terrno = TSDB_CODE_MND_TAG_ALREADY_EXIST;
+      terrno = TSDB_CODE_MND_COLUMN_ALREADY_EXIST;
       return -1;
     }
 
     if (mndFindSuperTableTagIndex(pOld, pSchemas[i].name) > 0) {
-      terrno = TSDB_CODE_MND_COLUMN_ALREADY_EXIST;
+      terrno = TSDB_CODE_MND_TAG_ALREADY_EXIST;
       return -1;
     }
   }
@@ -795,11 +796,21 @@ static int32_t mndAddSuperTableColumn(const SStbObj *pOld, SStbObj *pNew, const
 
 static int32_t mndDropSuperTableColumn(const SStbObj *pOld, SStbObj *pNew, const char *colName) {
   int32_t col = mndFindSuperTableColumnIndex(pOld, colName);
-  if (col <= 0) {
+  if (col < 0) {
     terrno = TSDB_CODE_MND_COLUMN_NOT_EXIST;
     return -1;
   }
 
+  if (col == 0) {
+    terrno = TSDB_CODE_MND_INVALID_STB_ALTER_OPTION;
+    return -1;
+  }
+
+  if (pOld->numOfColumns == 2) {
+    terrno = TSDB_CODE_MND_INVALID_STB_ALTER_OPTION;
+    return -1;
+  }
+
   if (mndAllocStbSchemas(pOld, pNew) != 0) {
     return -1;
   }
@@ -834,13 +845,13 @@ static int32_t mndAlterStbColumnBytes(const SStbObj *pOld, SStbObj *pNew, const
   }
 
   SSchema *pCol = pNew->pColumns + col;
-  if (pSchema->bytes <= pCol->bytes) {
-    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
+  if (!(pCol->type == TSDB_DATA_TYPE_BINARY || pCol->type == TSDB_DATA_TYPE_NCHAR)) {
+    terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
     return -1;
   }
 
-  if (!(pCol->type == TSDB_DATA_TYPE_BINARY || pCol->type == TSDB_DATA_TYPE_NCHAR)) {
-    terrno = TSDB_CODE_MND_INVALID_STB_OPTION;
+  if (pSchema->bytes <= pCol->bytes) {
+    terrno = TSDB_CODE_MND_INVALID_ROW_BYTES;
     return -1;
   }
 
diff --git a/source/dnode/mnode/impl/test/stb/stb.cpp b/source/dnode/mnode/impl/test/stb/stb.cpp
index fd0a7dbb7337ae6c437ae3cb0a849f79d3842d19..402795eb039bd8992545f690318ca9aabbf02acb 100644
--- a/source/dnode/mnode/impl/test/stb/stb.cpp
+++ b/source/dnode/mnode/impl/test/stb/stb.cpp
@@ -23,13 +23,18 @@ class MndTestStb : public ::testing::Test {
   void TearDown() override {}
 
   SCreateDbReq*   BuildCreateDbReq(const char* dbname, int32_t* pContLen);
+  SDropDbReq*     BuildDropDbReq(const char* dbname, int32_t* pContLen);
   SMCreateStbReq* BuildCreateStbReq(const char* stbname, int32_t* pContLen);
   SMAltertbReq*   BuildAlterStbAddTagReq(const char* stbname, const char* tagname, int32_t* pContLen);
   SMAltertbReq*   BuildAlterStbDropTagReq(const char* stbname, const char* tagname, int32_t* pContLen);
   SMAltertbReq*   BuildAlterStbUpdateTagNameReq(const char* stbname, const char* tagname, const char* newtagname,
                                                 int32_t* pContLen);
   SMAltertbReq*   BuildAlterStbUpdateTagBytesReq(const char* stbname, const char* tagname, int32_t bytes,
-                                                  int32_t* pContLen);
+                                                 int32_t* pContLen);
+  SMAltertbReq*   BuildAlterStbAddColumnReq(const char* stbname, const char* colname, int32_t* pContLen);
+  SMAltertbReq*   BuildAlterStbDropColumnReq(const char* stbname, const char* colname, int32_t* pContLen);
+  SMAltertbReq*   BuildAlterStbUpdateColumnBytesReq(const char* stbname, const char* colname, int32_t bytes,
+                                                    int32_t* pContLen);
 };
 
 Testbase MndTestStb::test;
@@ -63,6 +68,16 @@ SCreateDbReq* MndTestStb::BuildCreateDbReq(const char* dbname, int32_t* pContLen
   return pReq;
 }
 
+SDropDbReq* MndTestStb::BuildDropDbReq(const char* dbname, int32_t* pContLen) {
+  int32_t contLen = sizeof(SDropDbReq);
+
+  SDropDbReq* pReq = (SDropDbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->db, dbname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
 SMCreateStbReq* MndTestStb::BuildCreateStbReq(const char* stbname, int32_t* pContLen) {
   int32_t cols = 2;
   int32_t tags = 3;
@@ -82,8 +97,8 @@ SMCreateStbReq* MndTestStb::BuildCreateStbReq(const char* stbname, int32_t* pCon
 
   {
     SSchema* pSchema = &pReq->pSchemas[1];
-    pSchema->bytes = htonl(4);
-    pSchema->type = TSDB_DATA_TYPE_INT;
+    pSchema->bytes = htonl(12);
+    pSchema->type = TSDB_DATA_TYPE_BINARY;
     strcpy(pSchema->name, "col1");
   }
 
@@ -112,6 +127,126 @@ SMCreateStbReq* MndTestStb::BuildCreateStbReq(const char* stbname, int32_t* pCon
   return pReq;
 }
 
+SMAltertbReq* MndTestStb::BuildAlterStbAddTagReq(const char* stbname, const char* tagname, int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_ADD_TAG;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(12);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, tagname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
+SMAltertbReq* MndTestStb::BuildAlterStbDropTagReq(const char* stbname, const char* tagname, int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_DROP_TAG;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(12);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, tagname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
+SMAltertbReq* MndTestStb::BuildAlterStbUpdateTagNameReq(const char* stbname, const char* tagname,
+                                                        const char* newtagname, int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + 2 * sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_UPDATE_TAG_NAME;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(12);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, tagname);
+
+  pSchema = &pReq->pSchemas[1];
+  pSchema->bytes = htonl(12);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, newtagname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
+SMAltertbReq* MndTestStb::BuildAlterStbUpdateTagBytesReq(const char* stbname, const char* tagname, int32_t bytes,
+                                                         int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_UPDATE_TAG_BYTES;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(bytes);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, tagname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
+SMAltertbReq* MndTestStb::BuildAlterStbAddColumnReq(const char* stbname, const char* colname, int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_ADD_COLUMN;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(12);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, colname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
+SMAltertbReq* MndTestStb::BuildAlterStbDropColumnReq(const char* stbname, const char* colname, int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_DROP_COLUMN;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(12);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, colname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
+SMAltertbReq* MndTestStb::BuildAlterStbUpdateColumnBytesReq(const char* stbname, const char* colname, int32_t bytes,
+                                                            int32_t* pContLen) {
+  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
+  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
+  strcpy(pReq->name, stbname);
+  pReq->numOfSchemas = htonl(1);
+  pReq->alterType = TSDB_ALTER_TABLE_UPDATE_COLUMN_BYTES;
+
+  SSchema* pSchema = &pReq->pSchemas[0];
+  pSchema->bytes = htonl(bytes);
+  pSchema->type = TSDB_DATA_TYPE_BINARY;
+  strcpy(pSchema->name, colname);
+
+  *pContLen = contLen;
+  return pReq;
+}
+
 TEST_F(MndTestStb, 01_Create_Show_Meta_Drop_Restart_Stb) {
   const char* dbname = "1.d1";
   const char* stbname = "1.d1.stb";
@@ -197,9 +332,9 @@ TEST_F(MndTestStb, 01_Create_Show_Meta_Drop_Restart_Stb) {
 
     {
       SSchema* pSchema = &pRsp->pSchema[1];
-      EXPECT_EQ(pSchema->type, TSDB_DATA_TYPE_INT);
+      EXPECT_EQ(pSchema->type, TSDB_DATA_TYPE_BINARY);
       EXPECT_EQ(pSchema->colId, 2);
-      EXPECT_EQ(pSchema->bytes, 4);
+      EXPECT_EQ(pSchema->bytes, 12);
       EXPECT_STREQ(pSchema->name, "col1");
     }
 
@@ -254,89 +389,28 @@ TEST_F(MndTestStb, 01_Create_Show_Meta_Drop_Restart_Stb) {
     ASSERT_EQ(pRsp->code, 0);
   }
 
-  test.SendShowMetaReq(TSDB_MGMT_TABLE_STB, dbname);
-  CHECK_META("show stables", 4);
-  test.SendShowRetrieveReq();
-  EXPECT_EQ(test.GetShowRows(), 0);
-}
-
-SMAltertbReq* MndTestStb::BuildAlterStbAddTagReq(const char* stbname, const char* tagname, int32_t* pContLen) {
-  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
-  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
-  strcpy(pReq->name, stbname);
-  pReq->numOfSchemas = htonl(1);
-  pReq->alterType = TSDB_ALTER_TABLE_ADD_TAG;
-
-  SSchema* pSchema = &pReq->pSchemas[0];
-  pSchema->bytes = htonl(12);
-  pSchema->type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema->name, tagname);
-
-  *pContLen = contLen;
-  return pReq;
-}
-
-SMAltertbReq* MndTestStb::BuildAlterStbDropTagReq(const char* stbname, const char* tagname, int32_t* pContLen) {
-  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
-  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
-  strcpy(pReq->name, stbname);
-  pReq->numOfSchemas = htonl(1);
-  pReq->alterType = TSDB_ALTER_TABLE_DROP_TAG;
-
-  SSchema* pSchema = &pReq->pSchemas[0];
-  pSchema->bytes = htonl(12);
-  pSchema->type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema->name, tagname);
-
-  *pContLen = contLen;
-  return pReq;
-}
-
-SMAltertbReq* MndTestStb::BuildAlterStbUpdateTagNameReq(const char* stbname, const char* tagname,
-                                                        const char* newtagname, int32_t* pContLen) {
-  int32_t       contLen = sizeof(SMAltertbReq) + 2 * sizeof(SSchema);
-  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
-  strcpy(pReq->name, stbname);
-  pReq->numOfSchemas = htonl(1);
-  pReq->alterType = TSDB_ALTER_TABLE_UPDATE_TAG_NAME;
-
-  SSchema* pSchema = &pReq->pSchemas[0];
-  pSchema->bytes = htonl(12);
-  pSchema->type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema->name, tagname);
-
-  pSchema = &pReq->pSchemas[1];
-  pSchema->bytes = htonl(12);
-  pSchema->type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema->name, newtagname);
-
-  *pContLen = contLen;
-  return pReq;
-}
-
-SMAltertbReq* MndTestStb::BuildAlterStbUpdateTagBytesReq(const char* stbname, const char* tagname, int32_t bytes,
-                                                          int32_t* pContLen) {
-  int32_t       contLen = sizeof(SMAltertbReq) + sizeof(SSchema);
-  SMAltertbReq* pReq = (SMAltertbReq*)rpcMallocCont(contLen);
-  strcpy(pReq->name, stbname);
-  pReq->numOfSchemas = htonl(1);
-  pReq->alterType = TSDB_ALTER_TABLE_UPDATE_TAG_BYTES;
-
-  SSchema* pSchema = &pReq->pSchemas[0];
-  pSchema->bytes = htonl(bytes);
-  pSchema->type = TSDB_DATA_TYPE_BINARY;
-  strcpy(pSchema->name, tagname);
+  {
+    test.SendShowMetaReq(TSDB_MGMT_TABLE_STB, dbname);
+    CHECK_META("show stables", 4);
+    test.SendShowRetrieveReq();
+    EXPECT_EQ(test.GetShowRows(), 0);
+  }
 
-  *pContLen = contLen;
-  return pReq;
+  {
+    int32_t     contLen = 0;
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
 }
 
 TEST_F(MndTestStb, 02_Alter_Stb_AddTag) {
   const char* dbname = "1.d2";
   const char* stbname = "1.d2.stb";
+  int32_t     contLen = 0;
 
   {
-    int32_t       contLen = 0;
     SCreateDbReq* pReq = BuildCreateDbReq(dbname, &contLen);
     SRpcMsg*      pRsp = test.SendReq(TDMT_MND_CREATE_DB, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
@@ -344,15 +418,12 @@ TEST_F(MndTestStb, 02_Alter_Stb_AddTag) {
   }
 
   {
-    int32_t         contLen = 0;
     SMCreateStbReq* pReq = BuildCreateStbReq(stbname, &contLen);
     SRpcMsg*        pRsp = test.SendReq(TDMT_MND_CREATE_STB, pReq, contLen);
     ASSERT_NE(pRsp, nullptr);
     ASSERT_EQ(pRsp->code, 0);
   }
 
-  int32_t contLen = 0;
-
   {
     SMAltertbReq* pReq = BuildAlterStbAddTagReq("1.d3.stb", "tag4", &contLen);
     SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
@@ -391,6 +462,13 @@ TEST_F(MndTestStb, 02_Alter_Stb_AddTag) {
     CheckInt32(2);
     CheckInt32(4);
   }
+
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
 }
 
 TEST_F(MndTestStb, 03_Alter_Stb_DropTag) {
@@ -430,6 +508,13 @@ TEST_F(MndTestStb, 03_Alter_Stb_DropTag) {
     CheckInt32(2);
     CheckInt32(2);
   }
+
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
 }
 
 TEST_F(MndTestStb, 04_Alter_Stb_AlterTagName) {
@@ -492,10 +577,16 @@ TEST_F(MndTestStb, 04_Alter_Stb_AlterTagName) {
     CheckInt32(2);
     CheckInt32(3);
   }
-}
 
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+}
 
-TEST_F(MndTestStb, 04_Alter_Stb_AlterTagBytes) {
+TEST_F(MndTestStb, 05_Alter_Stb_AlterTagBytes) {
   const char* dbname = "1.d5";
   const char* stbname = "1.d5.stb";
   int32_t     contLen = 0;
@@ -534,7 +625,7 @@ TEST_F(MndTestStb, 04_Alter_Stb_AlterTagBytes) {
     SMAltertbReq* pReq = BuildAlterStbUpdateTagBytesReq(stbname, "tag3", 20, &contLen);
     SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
     ASSERT_EQ(pRsp->code, 0);
- 
+
     test.SendShowMetaReq(TSDB_MGMT_TABLE_STB, dbname);
     test.SendShowRetrieveReq();
     EXPECT_EQ(test.GetShowRows(), 1);
@@ -543,4 +634,205 @@ TEST_F(MndTestStb, 04_Alter_Stb_AlterTagBytes) {
     CheckInt32(2);
     CheckInt32(3);
   }
-}
\ No newline at end of file
+
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+}
+
+TEST_F(MndTestStb, 06_Alter_Stb_AddColumn) {
+  const char* dbname = "1.d6";
+  const char* stbname = "1.d6.stb";
+  int32_t     contLen = 0;
+
+  {
+    SCreateDbReq* pReq = BuildCreateDbReq(dbname, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_CREATE_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMCreateStbReq* pReq = BuildCreateStbReq(stbname, &contLen);
+    SRpcMsg*        pRsp = test.SendReq(TDMT_MND_CREATE_STB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbAddColumnReq("1.d7.stb", "tag4", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_INVALID_DB);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbAddColumnReq("1.d6.stb3", "tag4", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_STB_NOT_EXIST);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbAddColumnReq(stbname, "tag3", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_TAG_ALREADY_EXIST);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbAddColumnReq(stbname, "col1", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_COLUMN_ALREADY_EXIST);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbAddColumnReq(stbname, "col2", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+
+    test.SendShowMetaReq(TSDB_MGMT_TABLE_STB, dbname);
+    test.SendShowRetrieveReq();
+    EXPECT_EQ(test.GetShowRows(), 1);
+    CheckBinary("stb", TSDB_TABLE_NAME_LEN);
+    CheckTimestamp();
+    CheckInt32(3);
+    CheckInt32(3);
+  }
+
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+}
+
+TEST_F(MndTestStb, 07_Alter_Stb_DropColumn) {
+  const char* dbname = "1.d7";
+  const char* stbname = "1.d7.stb";
+  int32_t     contLen = 0;
+
+  {
+    SCreateDbReq* pReq = BuildCreateDbReq(dbname, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_CREATE_DB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMCreateStbReq* pReq = BuildCreateStbReq(stbname, &contLen);
+    SRpcMsg*        pRsp = test.SendReq(TDMT_MND_CREATE_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbDropColumnReq(stbname, "col4", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_COLUMN_NOT_EXIST);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbDropColumnReq(stbname, "col1", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_INVALID_STB_ALTER_OPTION);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbDropColumnReq(stbname, "ts", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_INVALID_STB_ALTER_OPTION);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbAddColumnReq(stbname, "col2", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbDropColumnReq(stbname, "col1", &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+
+    test.SendShowMetaReq(TSDB_MGMT_TABLE_STB, dbname);
+    test.SendShowRetrieveReq();
+    EXPECT_EQ(test.GetShowRows(), 1);
+    CheckBinary("stb", TSDB_TABLE_NAME_LEN);
+    CheckTimestamp();
+    CheckInt32(2);
+    CheckInt32(3);
+  }
+
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+}
+
+TEST_F(MndTestStb, 08_Alter_Stb_AlterTagBytes) {
+  const char* dbname = "1.d8";
+  const char* stbname = "1.d8.stb";
+  int32_t     contLen = 0;
+
+  {
+    SCreateDbReq* pReq = BuildCreateDbReq(dbname, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_CREATE_DB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMCreateStbReq* pReq = BuildCreateStbReq(stbname, &contLen);
+    SRpcMsg*        pRsp = test.SendReq(TDMT_MND_CREATE_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbUpdateColumnBytesReq(stbname, "col5", 12, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_COLUMN_NOT_EXIST);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbUpdateColumnBytesReq(stbname, "ts", 8, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_INVALID_STB_OPTION);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbUpdateColumnBytesReq(stbname, "col1", 8, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_INVALID_ROW_BYTES);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbUpdateColumnBytesReq(stbname, "col1", TSDB_MAX_BYTES_PER_ROW, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, TSDB_CODE_MND_INVALID_ROW_BYTES);
+  }
+
+  {
+    SMAltertbReq* pReq = BuildAlterStbUpdateColumnBytesReq(stbname, "col1", 20, &contLen);
+    SRpcMsg*      pRsp = test.SendReq(TDMT_MND_ALTER_STB, pReq, contLen);
+    ASSERT_EQ(pRsp->code, 0);
+
+    test.SendShowMetaReq(TSDB_MGMT_TABLE_STB, dbname);
+    test.SendShowRetrieveReq();
+    EXPECT_EQ(test.GetShowRows(), 1);
+    CheckBinary("stb", TSDB_TABLE_NAME_LEN);
+    CheckTimestamp();
+    CheckInt32(2);
+    CheckInt32(3);
+  }
+
+  {
+    SDropDbReq* pReq = BuildDropDbReq(dbname, &contLen);
+    SRpcMsg*    pRsp = test.SendReq(TDMT_MND_DROP_DB, pReq, contLen);
+    ASSERT_NE(pRsp, nullptr);
+    ASSERT_EQ(pRsp->code, 0);
+  }
+}
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index fd67067b7cd8657c1152c162279efb092a77af34..0cfffab52198a20e0b20b5e7b13d265a4c640e2f 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -228,17 +228,19 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_VGROUP_NOT_EXIST,         "VGroup does not exist
 // mnode-stable
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_STB_ALREADY_EXIST,        "Stable already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_STB_NOT_EXIST,            "Stable not exist")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_NAME_CONFLICT_WITH_TOPIC, "Stable confilct with topic")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_STBS,            "Too many stables")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_STB,              "Invalid stable name")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_STB_OPTION,       "Invalid stable options")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_STB_OPTION_UNCHNAGED,     "Stable options not changed")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_STB_ALTER_OPTION, "Invalid stable alter options")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_STB_OPTION_UNCHNAGED,     "Stable option unchanged")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_ROW_BYTES,        "Invalid row bytes")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_TAGS,            "Too many tags")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TAG_ALREADY_EXIST,        "Tag already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TAG_NOT_EXIST,            "Tag does not exist")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_COLUMNS,         "Too many columns")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_COLUMN_ALREADY_EXIST,     "Column already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_COLUMN_NOT_EXIST,         "Column does not exist")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_ROW_BYTES,        "Invalid row bytes")
 
 // mnode-func
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_FUNC_ALREADY_EXIST,       "Func already exists")