diff --git a/tests/system-test/7-tmq/subscribeDb.py b/tests/system-test/7-tmq/subscribeDb.py
index b536a70515a38eec91a4a007a2f4850c0056e89e..65a6f5fad63c9351f46a45f2727d92c501b06e85 100644
--- a/tests/system-test/7-tmq/subscribeDb.py
+++ b/tests/system-test/7-tmq/subscribeDb.py
@@ -93,7 +93,7 @@ class TDTestCase:
         tdLog.info(shellCmd)
         os.system(shellCmd)
 
-    def create_tables(self,tsql, dbName,vgroups,stbName,ctbNum,rowsPerTbl):
+    def create_tables(self,tsql, dbName,vgroups,stbName,ctbNum):
         tsql.execute("create database if not exists %s vgroups %d"%(dbName, vgroups))        
         tsql.execute("use %s" %dbName)
         tsql.execute("create table  if not exists %s (ts timestamp, c1 bigint, c2 binary(16)) tags(t1 int)"%stbName)
@@ -147,8 +147,7 @@ class TDTestCase:
                            parameterDict["dbName"],\
                            parameterDict["vgroups"],\
                            parameterDict["stbName"],\
-                           parameterDict["ctbNum"],\
-                           parameterDict["rowsPerTbl"])
+                           parameterDict["ctbNum"])
 
         self.insert_data(tsql,\
                          parameterDict["dbName"],\
@@ -322,6 +321,75 @@ class TDTestCase:
 
         tdLog.printNoPrefix("======== test case 2 end ...... ")
 
+    def tmqCase2a(self, cfgPath, buildPath):
+        tdLog.printNoPrefix("======== test case 2a: Produce while two consumers to subscribe one db, inclue 1 stb")
+        tdLog.info("step 1: create database, stb, ctb and insert data")
+        # create and start thread
+        parameterDict = {'cfg':        '',       \
+                         'dbName':     'db2a',    \
+                         'vgroups':    4,        \
+                         'stbName':    'stb1',    \
+                         'ctbNum':     10,       \
+                         'rowsPerTbl': 10000,    \
+                         'batchNum':   100,      \
+                         'startTs':    1640966400000}  # 2022-01-01 00:00:00.000
+        parameterDict['cfg'] = cfgPath
+
+        self.initConsumerTable()
+
+        tdSql.execute("create database if not exists %s vgroups %d" %(parameterDict['dbName'], parameterDict['vgroups']))
+        tdSql.execute("create table  if not exists %s.%s (ts timestamp, c1 bigint, c2 binary(16)) tags(t1 int)"%(parameterDict['dbName'], parameterDict['stbName']))
+        
+        tdLog.info("create topics from db")
+        topicName1 = 'topic_db1'
+        
+        tdSql.execute("create topic %s as %s" %(topicName1, parameterDict['dbName']))
+        
+        consumerId   = 0
+        expectrowcnt = parameterDict["rowsPerTbl"] * parameterDict["ctbNum"]
+        topicList    = topicName1
+        ifcheckdata  = 0
+        ifManualCommit = 1
+        keyList      = 'group.id:cgrp1,\
+                        enable.auto.commit:false,\
+                        auto.commit.interval.ms:6000,\
+                        auto.offset.reset:earliest'
+        self.insertConsumerInfo(consumerId, expectrowcnt,topicList,keyList,ifcheckdata,ifManualCommit)
+
+        consumerId   = 1
+        keyList      = 'group.id:cgrp2,\
+                        enable.auto.commit:false,\
+                        auto.commit.interval.ms:6000,\
+                        auto.offset.reset:earliest'
+        self.insertConsumerInfo(consumerId, expectrowcnt,topicList,keyList,ifcheckdata,ifManualCommit)
+        
+        tdLog.info("start consume processor")
+        pollDelay = 10
+        showMsg   = 1
+        showRow   = 1        
+        self.startTmqSimProcess(buildPath,cfgPath,pollDelay,parameterDict["dbName"],showMsg, showRow)
+
+        prepareEnvThread = threading.Thread(target=self.prepareEnv, kwargs=parameterDict)
+        prepareEnvThread.start()
+
+        # wait for data ready
+        prepareEnvThread.join()
+        
+        tdLog.info("insert process end, and start to check consume result")
+        expectRows = 2
+        resultList = self.selectConsumeResult(expectRows)
+        totalConsumeRows = 0
+        for i in range(expectRows):
+            totalConsumeRows += resultList[i]
+        
+        if totalConsumeRows != expectrowcnt * 2:
+            tdLog.info("act consume rows: %d, expect consume rows: %d"%(totalConsumeRows, expectrowcnt*2))
+            tdLog.exit("tmq consume rows error!")
+
+        tdSql.query("drop topic %s"%topicName1)
+
+        tdLog.printNoPrefix("======== test case 2a end ...... ")
+
     def tmqCase3(self, cfgPath, buildPath):
         tdLog.printNoPrefix("======== test case 3: Produce while one consumers to subscribe one db, include 2 stb")
         tdLog.info("step 1: create database, stb, ctb and insert data")
@@ -745,6 +813,7 @@ class TDTestCase:
 
         self.tmqCase1(cfgPath, buildPath)
         self.tmqCase2(cfgPath, buildPath) 
+        # self.tmqCase2a(cfgPath, buildPath) 
         self.tmqCase3(cfgPath, buildPath)
         self.tmqCase4(cfgPath, buildPath)
         self.tmqCase5(cfgPath, buildPath)