diff --git a/source/dnode/mnode/impl/inc/mndDef.h b/source/dnode/mnode/impl/inc/mndDef.h
index 4d5aab4590f06ed5cfb944a9b60029819651e65e..2164c98c83ec2a976695084692ecfb179d21ca0a 100644
--- a/source/dnode/mnode/impl/inc/mndDef.h
+++ b/source/dnode/mnode/impl/inc/mndDef.h
@@ -473,7 +473,7 @@ typedef struct {
   char*          ast;
   char*          physicalPlan;
   SSchemaWrapper schema;
-  int32_t        refConsumerCnt;
+  // int32_t        refConsumerCnt;
 } SMqTopicObj;
 
 typedef struct {
diff --git a/source/dnode/mnode/impl/src/mndConsumer.c b/source/dnode/mnode/impl/src/mndConsumer.c
index 7cebeb35f5bb9e3f2b363c438a1ce70ad3296717..c3eaeb73b2e21a7d26c7b260a7ebf43c87d707d1 100644
--- a/source/dnode/mnode/impl/src/mndConsumer.c
+++ b/source/dnode/mnode/impl/src/mndConsumer.c
@@ -414,6 +414,7 @@ static int32_t mndProcessSubscribeReq(SRpcMsg *pMsg) {
       goto SUBSCRIBE_OVER;
     }
 
+#if 0
     // ref topic to prevent drop
     // TODO make topic complete
     SMqTopicObj topicObj = {0};
@@ -422,6 +423,7 @@ static int32_t mndProcessSubscribeReq(SRpcMsg *pMsg) {
     mInfo("subscribe topic %s by consumer %ld cgroup %s, refcnt %d", pTopic->name, consumerId, cgroup,
           topicObj.refConsumerCnt);
     if (mndSetTopicCommitLogs(pMnode, pTrans, &topicObj) != 0) goto SUBSCRIBE_OVER;
+#endif
 
     mndReleaseTopic(pMnode, pTopic);
   }
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 95d3383ee10e378c4c5a66e9d16de4fda90db9ed..99ac9c729c99f3874ce197b1692c46296a9bc4b5 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -1044,9 +1044,9 @@ static int32_t mndDropDb(SMnode *pMnode, SRpcMsg *pReq, SDbObj *pDb) {
 
   if (mndSetDropDbRedoLogs(pMnode, pTrans, pDb) != 0) goto _OVER;
   if (mndSetDropDbCommitLogs(pMnode, pTrans, pDb) != 0) goto _OVER;
-  /*if (mndDropOffsetByDB(pMnode, pTrans, pDb) != 0) goto _OVER;*/
-  /*if (mndDropSubByDB(pMnode, pTrans, pDb) != 0) goto _OVER;*/
-  /*if (mndDropTopicByDB(pMnode, pTrans, pDb) != 0) goto _OVER;*/
+  if (mndDropOffsetByDB(pMnode, pTrans, pDb) != 0) goto _OVER;
+  if (mndDropSubByDB(pMnode, pTrans, pDb) != 0) goto _OVER;
+  if (mndDropTopicByDB(pMnode, pTrans, pDb) != 0) goto _OVER;
   if (mndSetDropDbRedoActions(pMnode, pTrans, pDb) != 0) goto _OVER;
 
   SUserObj *pUser = mndAcquireUser(pMnode, pDb->createUser);
diff --git a/source/dnode/mnode/impl/src/mndOffset.c b/source/dnode/mnode/impl/src/mndOffset.c
index 01516d03f28f168b71ea5272bf983c181a059bcd..6cbaca3c07818304417f05baed75fdeab70da5ca 100644
--- a/source/dnode/mnode/impl/src/mndOffset.c
+++ b/source/dnode/mnode/impl/src/mndOffset.c
@@ -21,6 +21,7 @@
 #include "mndMnode.h"
 #include "mndShow.h"
 #include "mndStb.h"
+#include "mndTopic.h"
 #include "mndTrans.h"
 #include "mndUser.h"
 #include "mndVgroup.h"
@@ -188,7 +189,15 @@ static int32_t mndProcessCommitOffsetReq(SRpcMsg *pMsg) {
     bool          create = false;
     SMqOffsetObj *pOffsetObj = mndAcquireOffset(pMnode, key);
     if (pOffsetObj == NULL) {
+      SMqTopicObj *pTopic = mndAcquireTopic(pMnode, pOffset->topicName);
+      if (pTopic == NULL) {
+        terrno = TSDB_CODE_MND_TOPIC_NOT_EXIST;
+        mError("submit offset to topic %s failed since  %s", pOffset->topicName, terrstr());
+        continue;
+      }
       pOffsetObj = taosMemoryMalloc(sizeof(SMqOffsetObj));
+      pOffsetObj->dbUid = pTopic->dbUid;
+      mndReleaseTopic(pMnode, pTopic);
       memcpy(pOffsetObj->key, key, TSDB_PARTITION_KEY_LEN);
       create = true;
     }
diff --git a/source/dnode/mnode/impl/src/mndScheduler.c b/source/dnode/mnode/impl/src/mndScheduler.c
index 58b51e4c548106a393b65ab3142064cd0c249481..d1404b96fe09e51f2130cea5d0158a7435098f06 100644
--- a/source/dnode/mnode/impl/src/mndScheduler.c
+++ b/source/dnode/mnode/impl/src/mndScheduler.c
@@ -286,7 +286,7 @@ int32_t mndScheduleStream(SMnode* pMnode, STrans* pTrans, SStreamObj* pStream) {
   pStream->tasks = taosArrayInit(totLevel, sizeof(void*));
 
   bool hasExtraSink = false;
-  if (totLevel == 2) {
+  if (totLevel == 2 || strcmp(pStream->sourceDb, pStream->targetDb) != 0) {
     SArray* taskOneLevel = taosArrayInit(0, sizeof(void*));
     taosArrayPush(pStream->tasks, &taskOneLevel);
     // add extra sink
@@ -407,7 +407,7 @@ int32_t mndScheduleStream(SMnode* pMnode, STrans* pTrans, SStreamObj* pStream) {
 
           /*pTask->dispatchMsgType = TDMT_VND_TASK_WRITE_EXEC;*/
           pTask->dispatchMsgType = TDMT_VND_TASK_DISPATCH;
-          SDbObj* pDb = mndAcquireDb(pMnode, pStream->sourceDb);
+          SDbObj* pDb = mndAcquireDb(pMnode, pStream->targetDb);
           ASSERT(pDb);
           if (mndExtractDbInfo(pMnode, pDb, &pTask->shuffleDispatcher.dbInfo, NULL) < 0) {
             sdbRelease(pSdb, pDb);
diff --git a/source/dnode/mnode/impl/src/mndStream.c b/source/dnode/mnode/impl/src/mndStream.c
index cbef1facdcd5c1a680c90b3f11936316e12a2a4f..13071b5c538a45f9339f4bc97fce9d9e3239a0f6 100644
--- a/source/dnode/mnode/impl/src/mndStream.c
+++ b/source/dnode/mnode/impl/src/mndStream.c
@@ -393,6 +393,15 @@ static int32_t mndCreateStream(SMnode *pMnode, SRpcMsg *pReq, SCMCreateStreamReq
   streamObj.trigger = pCreate->triggerType;
   streamObj.waterMark = pCreate->watermark;
 
+  if (streamObj.targetSTbName[0]) {
+    pDb = mndAcquireDbByStb(pMnode, streamObj.targetSTbName);
+    if (pDb == NULL) {
+      terrno = TSDB_CODE_MND_DB_NOT_SELECTED;
+      return -1;
+    }
+    tstrncpy(streamObj.targetDb, pDb->name, TSDB_DB_FNAME_LEN);
+  }
+
   STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_TYPE_CREATE_STREAM, pReq);
   if (pTrans == NULL) {
     mError("stream:%s, failed to create since %s", pCreate->name, terrstr());
diff --git a/source/dnode/mnode/impl/src/mndSubscribe.c b/source/dnode/mnode/impl/src/mndSubscribe.c
index e58630ddbfdcc8cb01f26ce3aa478e68fac76fa6..f360f34e147148b44763ef44972cdf0e082da33b 100644
--- a/source/dnode/mnode/impl/src/mndSubscribe.c
+++ b/source/dnode/mnode/impl/src/mndSubscribe.c
@@ -157,6 +157,7 @@ static int32_t mndPersistSubChangeVgReq(SMnode *pMnode, STrans *pTrans, const SM
   int32_t vgId = pRebVg->pVgEp->vgId;
   SVgObj *pVgObj = mndAcquireVgroup(pMnode, vgId);
   if (pVgObj == NULL) {
+    ASSERT(0);
     taosMemoryFree(buf);
     return -1;
   }
@@ -451,6 +452,7 @@ static int32_t mndPersistRebResult(SMnode *pMnode, SRpcMsg *pMsg, const SMqRebOu
     taosArrayPush(pConsumerNew->rebNewTopics, &topic);
     mndReleaseConsumer(pMnode, pConsumerOld);
     if (mndSetConsumerCommitLogs(pMnode, pTrans, pConsumerNew) != 0) {
+      ASSERT(0);
       goto REB_FAIL;
     }
   }
@@ -469,9 +471,11 @@ static int32_t mndPersistRebResult(SMnode *pMnode, SRpcMsg *pMsg, const SMqRebOu
     taosArrayPush(pConsumerNew->rebRemovedTopics, &topic);
     mndReleaseConsumer(pMnode, pConsumerOld);
     if (mndSetConsumerCommitLogs(pMnode, pTrans, pConsumerNew) != 0) {
+      ASSERT(0);
       goto REB_FAIL;
     }
   }
+#if 0
   if (consumerNum) {
     char topic[TSDB_TOPIC_FNAME_LEN];
     char cgroup[TSDB_CGROUP_LEN];
@@ -486,9 +490,13 @@ static int32_t mndPersistRebResult(SMnode *pMnode, SRpcMsg *pMsg, const SMqRebOu
       pTopic->refConsumerCnt = topicObj.refConsumerCnt;
       mInfo("subscribe topic %s unref %d consumer cgroup %s, refcnt %d", pTopic->name, consumerNum, cgroup,
             topicObj.refConsumerCnt);
-      if (mndSetTopicCommitLogs(pMnode, pTrans, &topicObj) != 0) goto REB_FAIL;
+      if (mndSetTopicCommitLogs(pMnode, pTrans, &topicObj) != 0) {
+        ASSERT(0);
+        goto REB_FAIL;
+      }
     }
   }
+#endif
 
   // 4. TODO commit log: modification log
 
@@ -496,7 +504,10 @@ static int32_t mndPersistRebResult(SMnode *pMnode, SRpcMsg *pMsg, const SMqRebOu
   mndTransSetCb(pTrans, TRANS_START_FUNC_MQ_REB, TRANS_STOP_FUNC_TEST_MQ_REB, NULL, 0);
 
   // 6. execution
-  if (mndTransPrepare(pMnode, pTrans) != 0) goto REB_FAIL;
+  if (mndTransPrepare(pMnode, pTrans) != 0) {
+    ASSERT(0);
+    goto REB_FAIL;
+  }
 
   mndTransDrop(pTrans);
   return 0;
diff --git a/source/dnode/mnode/impl/src/mndTopic.c b/source/dnode/mnode/impl/src/mndTopic.c
index 2048c798475062055520fe25e0249f411615b81f..720233d625c0c20c169478e2a3a885dfa5a55f16 100644
--- a/source/dnode/mnode/impl/src/mndTopic.c
+++ b/source/dnode/mnode/impl/src/mndTopic.c
@@ -15,6 +15,7 @@
 
 #include "mndTopic.h"
 #include "mndAuth.h"
+#include "mndConsumer.h"
 #include "mndDb.h"
 #include "mndDnode.h"
 #include "mndMnode.h"
@@ -121,7 +122,7 @@ SSdbRaw *mndTopicActionEncode(SMqTopicObj *pTopic) {
     SDB_SET_BINARY(pRaw, dataPos, swBuf, schemaLen, TOPIC_ENCODE_OVER);
   }
 
-  SDB_SET_INT32(pRaw, dataPos, pTopic->refConsumerCnt, TOPIC_ENCODE_OVER);
+  /*SDB_SET_INT32(pRaw, dataPos, pTopic->refConsumerCnt, TOPIC_ENCODE_OVER);*/
 
   SDB_SET_RESERVE(pRaw, dataPos, MND_TOPIC_RESERVE_SIZE, TOPIC_ENCODE_OVER);
   SDB_SET_DATALEN(pRaw, dataPos, TOPIC_ENCODE_OVER);
@@ -221,7 +222,7 @@ SSdbRow *mndTopicActionDecode(SSdbRaw *pRaw) {
     pTopic->schema.pSchema = NULL;
   }
 
-  SDB_GET_INT32(pRaw, dataPos, &pTopic->refConsumerCnt, TOPIC_DECODE_OVER);
+  /*SDB_GET_INT32(pRaw, dataPos, &pTopic->refConsumerCnt, TOPIC_DECODE_OVER);*/
 
   SDB_GET_RESERVE(pRaw, dataPos, MND_TOPIC_RESERVE_SIZE, TOPIC_DECODE_OVER);
 
@@ -253,7 +254,7 @@ static int32_t mndTopicActionUpdate(SSdb *pSdb, SMqTopicObj *pOldTopic, SMqTopic
   atomic_exchange_64(&pOldTopic->updateTime, pNewTopic->updateTime);
   atomic_exchange_32(&pOldTopic->version, pNewTopic->version);
 
-  atomic_store_32(&pOldTopic->refConsumerCnt, pNewTopic->refConsumerCnt);
+  /*atomic_store_32(&pOldTopic->refConsumerCnt, pNewTopic->refConsumerCnt);*/
 
   /*taosWLockLatch(&pOldTopic->lock);*/
 
@@ -327,7 +328,7 @@ static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *
   topicObj.version = 1;
   topicObj.sql = strdup(pCreate->sql);
   topicObj.sqlLen = strlen(pCreate->sql) + 1;
-  topicObj.refConsumerCnt = 0;
+  /*topicObj.refConsumerCnt = 0;*/
 
   if (pCreate->ast && pCreate->ast[0]) {
     topicObj.ast = strdup(pCreate->ast);
@@ -492,8 +493,8 @@ static int32_t mndDropTopic(SMnode *pMnode, STrans *pTrans, SRpcMsg *pReq, SMqTo
 }
 
 static int32_t mndProcessDropTopicReq(SRpcMsg *pReq) {
-  SMnode *pMnode = pReq->info.node;
-  /*SSdb          *pSdb = pMnode->pSdb;*/
+  SMnode        *pMnode = pReq->info.node;
+  SSdb          *pSdb = pMnode->pSdb;
   SMDropTopicReq dropReq = {0};
 
   if (tDeserializeSMDropTopicReq(pReq->pCont, pReq->contLen, &dropReq) != 0) {
@@ -513,12 +514,36 @@ static int32_t mndProcessDropTopicReq(SRpcMsg *pReq) {
     }
   }
 
+  void           *pIter = NULL;
+  SMqConsumerObj *pConsumer;
+  while (1) {
+    pIter = sdbFetch(pSdb, SDB_CONSUMER, pIter, (void **)&pConsumer);
+    if (pIter == NULL) break;
+
+    if (pConsumer->status == MQ_CONSUMER_STATUS__LOST_REBD) continue;
+    int32_t sz = taosArrayGetSize(pConsumer->assignedTopics);
+    for (int32_t i = 0; i < sz; i++) {
+      char *name = taosArrayGetP(pConsumer->assignedTopics, i);
+      if (strcmp(name, pTopic->name) == 0) {
+        mndReleaseConsumer(pMnode, pConsumer);
+        mndReleaseTopic(pMnode, pTopic);
+        terrno = TSDB_CODE_MND_TOPIC_SUBSCRIBED;
+        mError("topic:%s, failed to drop since subscribed by consumer %ld from cgroup %s", dropReq.name,
+               pConsumer->consumerId, pConsumer->cgroup);
+        return -1;
+      }
+    }
+    sdbRelease(pSdb, pConsumer);
+  }
+
+#if 0
   if (pTopic->refConsumerCnt != 0) {
     mndReleaseTopic(pMnode, pTopic);
     terrno = TSDB_CODE_MND_TOPIC_SUBSCRIBED;
     mError("topic:%s, failed to drop since %s", dropReq.name, terrstr());
     return -1;
   }
+#endif
 
   STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_TYPE_DROP_TOPIC, pReq);
   if (pTrans == NULL) {
diff --git a/tests/system-test/7-tmq/subscribeDb1.py b/tests/system-test/7-tmq/subscribeDb1.py
index 56db157ab849f609eb22debde6936d2de406ee06..b86364b9c3ce4fd3750cba8a3cd96ee744473b11 100644
--- a/tests/system-test/7-tmq/subscribeDb1.py
+++ b/tests/system-test/7-tmq/subscribeDb1.py
@@ -382,6 +382,7 @@ class TDTestCase:
             tdLog.info("act consume rows: %d, expect consume rows: %d"%(totalConsumeRows, expectrowcnt))
             tdLog.exit("tmq consume rows error!")
 
+        time.sleep(15)
         tdSql.query("drop topic %s"%topicName1)
 
         tdLog.printNoPrefix("======== test case 10 end ...... ")
@@ -453,6 +454,7 @@ class TDTestCase:
             tdLog.info("act consume rows: %d, expect consume rows: %d"%(totalConsumeRows, expectrowcnt))
             tdLog.exit("tmq consume rows error!")
 
+        time.sleep(15)
         tdSql.query("drop topic %s"%topicName1)
 
         tdLog.printNoPrefix("======== test case 11 end ...... ")