diff --git a/include/common/tglobal.h b/include/common/tglobal.h
index b08916f891fba90f246206956b19741d916914cb..5dff313a9de8164cf26484a3e8ad11eec43e0167 100644
--- a/include/common/tglobal.h
+++ b/include/common/tglobal.h
@@ -162,6 +162,8 @@ extern char tsSmlTagName[];
 // extern bool    tsSmlDataFormat;
 // extern int32_t tsSmlBatchSize;
 
+extern int32_t tmqMaxTopicNum;
+
 // wal
 extern int64_t tsWalFsyncDataSizeLimit;
 
diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index b1c8ada6a482f3217b2ba6c06a16b10130580f4c..6147ad682064a0cb0efded329e0fa64289d756f6 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -768,6 +768,8 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_TMQ_CONSUMER_MISMATCH          TAOS_DEF_ERROR_CODE(0, 0x4001)
 #define TSDB_CODE_TMQ_CONSUMER_CLOSED            TAOS_DEF_ERROR_CODE(0, 0x4002)
 #define TSDB_CODE_TMQ_CONSUMER_ERROR             TAOS_DEF_ERROR_CODE(0, 0x4003)
+#define TSDB_CODE_TMQ_TOPIC_OUT_OF_RANGE         TAOS_DEF_ERROR_CODE(0, 0x4004)
+#define TSDB_CODE_TMQ_GROUP_OUT_OF_RANGE         TAOS_DEF_ERROR_CODE(0, 0x4005)
 
 // stream
 #define TSDB_CODE_STREAM_TASK_NOT_EXIST          TAOS_DEF_ERROR_CODE(0, 0x4100)
diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index dd64538f3d89a9a779ca511ccb35b8f6cd94b693..0f20d6fd2c9288f958a3c975ddc2a18a8b07142d 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -103,6 +103,8 @@ char tsSmlChildTableName[TSDB_TABLE_NAME_LEN] = "";  // user defined child table
 // bool    tsSmlDataFormat = false;
 // int32_t tsSmlBatchSize = 10000;
 
+// tmq
+int32_t tmqMaxTopicNum = 20;
 // query
 int32_t tsQueryPolicy = 1;
 int32_t tsQueryRspPolicy = 0;
@@ -777,6 +779,7 @@ static int32_t taosSetClientCfg(SConfig *pCfg) {
   tstrncpy(tsSmlTagName, cfgGetItem(pCfg, "smlTagName")->str, TSDB_COL_NAME_LEN);
   //  tsSmlDataFormat = cfgGetItem(pCfg, "smlDataFormat")->bval;
 
+  tmqMaxTopicNum = cfgGetItem(pCfg, "tmqMaxTopicNum")->i32;
   //  tsSmlBatchSize = cfgGetItem(pCfg, "smlBatchSize")->i32;
   tsMaxInsertBatchRows = cfgGetItem(pCfg, "maxInsertBatchRows")->i32;
 
@@ -1196,6 +1199,8 @@ int32_t taosApplyLocalCfg(SConfig *pCfg, char *name) {
         cfgSetItem(pCfg, "secondEp", tsSecond, pSecondpItem->stype);
       } else if (strcasecmp("smlChildTableName", name) == 0) {
         tstrncpy(tsSmlChildTableName, cfgGetItem(pCfg, "smlChildTableName")->str, TSDB_TABLE_NAME_LEN);
+      } else if (strcasecmp("tmqMaxTopicNum", name) == 0) {
+        tmqMaxTopicNum = cfgGetItem(pCfg, "tmqMaxTopicNum")->i32;
       } else if (strcasecmp("smlTagName", name) == 0) {
         tstrncpy(tsSmlTagName, cfgGetItem(pCfg, "smlTagName")->str, TSDB_COL_NAME_LEN);
         //      } else if (strcasecmp("smlDataFormat", name) == 0) {
diff --git a/source/dnode/mnode/impl/src/mndConsumer.c b/source/dnode/mnode/impl/src/mndConsumer.c
index a7c2e1e2c63224b622dd5e31fa96d2f30eb8b35f..1aed0ba3664340c0d1cd83ac03ddcd38917e27eb 100644
--- a/source/dnode/mnode/impl/src/mndConsumer.c
+++ b/source/dnode/mnode/impl/src/mndConsumer.c
@@ -26,6 +26,7 @@
 #define MND_CONSUMER_VER_NUMBER   1
 #define MND_CONSUMER_RESERVE_SIZE 64
 
+#define MND_MAX_GROUP_PER_TOPIC           100
 #define MND_CONSUMER_LOST_HB_CNT          6
 #define MND_CONSUMER_LOST_CLEAR_THRESHOLD 43200
 
@@ -635,6 +636,7 @@ int32_t mndProcessSubscribeReq(SRpcMsg *pMsg) {
   char           *cgroup = subscribe.cgroup;
   SMqConsumerObj *pExistedConsumer = NULL;
   SMqConsumerObj *pConsumerNew = NULL;
+  STrans         *pTrans       = NULL;
 
   int32_t code = -1;
   SArray *pTopicList = subscribe.topicNames;
@@ -642,9 +644,17 @@ int32_t mndProcessSubscribeReq(SRpcMsg *pMsg) {
   taosArrayRemoveDuplicate(pTopicList, taosArrayCompareString, freeItem);
 
   int32_t newTopicNum = taosArrayGetSize(pTopicList);
+  for(int i = 0; i < newTopicNum; i++){
+    SMqSubscribeObj *pSub = mndAcquireSubscribe(pMnode, (const char*)cgroup, (const char*)taosArrayGetP(pTopicList, i));
+    if(pSub != NULL && taosHashGetSize(pSub->consumerHash) > MND_MAX_GROUP_PER_TOPIC){
+      terrno = TSDB_CODE_TMQ_GROUP_OUT_OF_RANGE;
+      code = terrno;
+      goto _over;
+    }
+  }
 
   // check topic existence
-  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_RETRY, TRN_CONFLICT_NOTHING, pMsg, "subscribe");
+  pTrans = mndTransCreate(pMnode, TRN_POLICY_RETRY, TRN_CONFLICT_NOTHING, pMsg, "subscribe");
   if (pTrans == NULL) {
     goto _over;
   }
diff --git a/source/dnode/mnode/impl/src/mndTopic.c b/source/dnode/mnode/impl/src/mndTopic.c
index c9afbaf524bd70bea4635518e05004a8d4042e1f..551b08d2be0d0bcc7aaff6fbeaacf30a61b45d16 100644
--- a/source/dnode/mnode/impl/src/mndTopic.c
+++ b/source/dnode/mnode/impl/src/mndTopic.c
@@ -585,6 +585,11 @@ static int32_t mndProcessCreateTopicReq(SRpcMsg *pReq) {
   SMqTopicObj      *pTopic = NULL;
   SDbObj           *pDb = NULL;
   SCMCreateTopicReq createTopicReq = {0};
+  if (sdbGetSize(pMnode->pSdb, SDB_TOPIC) >= tmqMaxTopicNum){
+    terrno = TSDB_CODE_TMQ_TOPIC_OUT_OF_RANGE;
+    mError("topic num out of range");
+    return code;
+  }
 
   if (tDeserializeSCMCreateTopicReq(pReq->pCont, pReq->contLen, &createTopicReq) != 0) {
     terrno = TSDB_CODE_INVALID_MSG;
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index e4a00c1fc95e6e7c0143fbfecea07ec5a97158ae..e6ffec85ec0def87d1630251e4db5aefc0763634 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -629,7 +629,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_INDEX_INVALID_FILE,             "Index file is inval
 TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_INVALID_MSG,                "Invalid message")
 TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_CONSUMER_MISMATCH,          "Consumer mismatch")
 TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_CONSUMER_CLOSED,            "Consumer closed")
-TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_CONSUMER_ERROR,            "Consumer error, to see log")
+TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_CONSUMER_ERROR,             "Consumer error, to see log")
+TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_TOPIC_OUT_OF_RANGE,         "Topic num out of range")
+TAOS_DEFINE_ERROR(TSDB_CODE_TMQ_GROUP_OUT_OF_RANGE,         "Group num out of range 100")
 
 // stream
 TAOS_DEFINE_ERROR(TSDB_CODE_STREAM_TASK_NOT_EXIST,          "Stream task not exist")