diff --git a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_sync.py b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_sync.py
index 5db1ced199d0f9a3b42f558f09d96ade737338cd..22d3ba6dbc68c61bd8823ace82c7c50ffcdbdccc 100644
--- a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_sync.py
+++ b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_sync.py
@@ -179,22 +179,32 @@ class TDTestCase:
         
         tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
 
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+
         status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
         
         count = 0 
         while not status_OK :
             if count > self.try_check_times:
-                os.system("taos -s ' show {}.vgroups;'".format(dbname))
+                os.system("taos -s ' show {}.vgroups; '".format(dbname))
                 tdLog.exit(" ==== check insert rows failed  after {}  try check {} times  of database {}".format(count , self.try_check_times ,dbname))
                 break
             time.sleep(0.1)
             tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
             status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
             tdLog.info(" ==== check insert rows first failed , this is {}_th retry check rows of database {}".format(count , dbname))
             count += 1
         
 
         tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
         status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
         count = 0 
         while not status_OK :
@@ -204,10 +214,12 @@ class TDTestCase:
                 break
             time.sleep(0.1)
             tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
             status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
             tdLog.info(" ==== check insert tbnames first failed , this is {}_th retry check tbnames of database {}".format(count , dbname))
             count += 1
-
     def _get_stop_dnode_id(self,dbname):
         tdSql.query("show {}.vgroups".format(dbname))
         vgroup_infos = tdSql.queryResult
diff --git a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync.py b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync.py
index 854a28b48aa1f57701d3158079b8cbae2379675b..28198b95293d5c999f381be58bf3baf328708e29 100644
--- a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync.py
+++ b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync.py
@@ -174,11 +174,15 @@ class TDTestCase:
         os.system("taos -s 'select count(*) from {}.{}';".format(dbname,stablename))
 
     def check_insert_rows(self, dbname, stablename , tb_nums , row_nums, append_rows):
-
+    
         tdSql.execute("use {}".format(dbname))
         
         tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
 
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+
         status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
         
         count = 0 
@@ -189,12 +193,18 @@ class TDTestCase:
                 break
             time.sleep(0.1)
             tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
             status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
             tdLog.info(" ==== check insert rows first failed , this is {}_th retry check rows of database {}".format(count , dbname))
             count += 1
         
 
         tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
         status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
         count = 0 
         while not status_OK :
@@ -204,10 +214,13 @@ class TDTestCase:
                 break
             time.sleep(0.1)
             tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
             status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
             tdLog.info(" ==== check insert tbnames first failed , this is {}_th retry check tbnames of database {}".format(count , dbname))
             count += 1
-
+            
     def _get_stop_dnode_id(self,dbname):
         tdSql.query("show {}.vgroups".format(dbname))
         vgroup_infos = tdSql.queryResult
diff --git a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync_force_stop.py b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync_force_stop.py
new file mode 100644
index 0000000000000000000000000000000000000000..83faba45782e0bac1c6525917a8b585080267543
--- /dev/null
+++ b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_follower_unsync_force_stop.py
@@ -0,0 +1,521 @@
+# author : wenzhouwww
+from ssl import ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE
+import taos
+import sys
+import time
+import os 
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+from util.dnodes import TDDnodes
+from util.dnodes import TDDnode
+from util.cluster import *
+
+import datetime
+import inspect
+import time
+import socket
+import subprocess
+import threading
+sys.path.append(os.path.dirname(__file__))
+
+class TDTestCase:
+    def init(self,conn ,logSql):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor())
+        self.host = socket.gethostname()
+        self.mnode_list = {}
+        self.dnode_list = {}
+        self.ts = 1483200000000
+        self.ts_step =1000
+        self.db_name ='testdb'
+        self.replica = 3 
+        self.vgroups = 1
+        self.tb_nums = 10 
+        self.row_nums = 100
+        self.stop_dnode_id = None
+        self.loop_restart_times = 5
+        self.current_thread = None
+        self.max_restart_time = 10
+        self.try_check_times = 10
+
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root) - len("/build/bin")]
+                    break
+        return buildPath
+
+    def check_setup_cluster_status(self):
+        tdSql.query("show mnodes")
+        for mnode in tdSql.queryResult:
+            name = mnode[1]
+            info = mnode
+            self.mnode_list[name] = info
+
+        tdSql.query("show dnodes")
+        for dnode in tdSql.queryResult:
+            name = dnode[1]
+            info = dnode
+            self.dnode_list[name] = info
+
+        count = 0
+        is_leader = False
+        mnode_name = ''
+        for k,v in self.mnode_list.items():
+            count +=1
+            # only for 1 mnode
+            mnode_name = k
+
+            if v[2] =='leader':
+                is_leader=True
+
+        if count==1 and is_leader:
+            tdLog.info("===== depoly cluster success with 1 mnode as leader =====")
+        else:
+            tdLog.exit("===== depoly cluster fail with 1 mnode as leader =====")
+
+        for k ,v in self.dnode_list.items():
+            if k == mnode_name:
+                if v[3]==0:
+                    tdLog.info("===== depoly cluster mnode only success at {} , support_vnodes is {} ".format(mnode_name,v[3]))
+                else:
+                    tdLog.exit("===== depoly cluster mnode only fail at {} , support_vnodes is {} ".format(mnode_name,v[3]))
+            else:
+                continue
+
+    def create_db_check_vgroups(self):
+
+        tdSql.execute("drop database if exists test")
+        tdSql.execute("create database if not exists test replica 1 duration 300")
+        tdSql.execute("use test")
+        tdSql.execute(
+        '''create table stb1
+        (ts timestamp, c1 int, c2 bigint, c3 smallint, c4 tinyint, c5 float, c6 double, c7 bool, c8 binary(16),c9 nchar(32), c10 timestamp)
+        tags (t1 int)
+        '''
+        )
+        tdSql.execute(
+            '''
+            create table t1
+            (ts timestamp, c1 int, c2 bigint, c3 smallint, c4 tinyint, c5 float, c6 double, c7 bool, c8 binary(16),c9 nchar(32), c10 timestamp)
+            '''
+        )
+        
+        for i in range(5):
+            tdSql.execute("create table sub_tb_{} using stb1 tags({})".format(i,i))
+        tdSql.query("show stables")
+        tdSql.checkRows(1)
+        tdSql.query("show tables")
+        tdSql.checkRows(6)
+
+        tdSql.query("show test.vgroups;")
+        vgroups_infos = {}  # key is id: value is info list
+        for vgroup_info in tdSql.queryResult:
+            vgroup_id = vgroup_info[0]
+            tmp_list = []
+            for role in vgroup_info[3:-4]:
+                if role in ['leader','follower']:
+                    tmp_list.append(role)
+            vgroups_infos[vgroup_id]=tmp_list
+
+        for k , v in vgroups_infos.items():
+            if len(v) ==1 and v[0]=="leader":
+                tdLog.info(" === create database replica only 1 role leader  check success of vgroup_id {} ======".format(k))
+            else:
+                tdLog.exit(" === create database replica only 1 role leader  check fail of vgroup_id {} ======".format(k))
+
+    def create_database(self, dbname, replica_num ,vgroup_nums ):
+        drop_db_sql = "drop database if exists {}".format(dbname)
+        create_db_sql = "create database {} replica {} vgroups {}".format(dbname,replica_num,vgroup_nums)
+
+        tdLog.info(" ==== create database {} and insert rows begin =====".format(dbname))
+        tdSql.execute(drop_db_sql)
+        tdSql.execute(create_db_sql)
+        tdSql.execute("use {}".format(dbname))
+       
+    def create_stable_insert_datas(self,dbname ,stablename , tb_nums , row_nums):
+        tdSql.execute("use {}".format(dbname))
+        tdSql.execute(
+        '''create table {}
+        (ts timestamp, c1 int, c2 bigint, c3 smallint, c4 tinyint, c5 float, c6 double, c7 bool, c8 binary(32),c9 nchar(32), c10 timestamp)
+        tags (t1 int)
+        '''.format(stablename)
+        )
+    
+        for i in range(tb_nums):
+            sub_tbname = "sub_{}_{}".format(stablename,i)
+            tdSql.execute("create table {} using {} tags({})".format(sub_tbname, stablename ,i))
+            # insert datas about new database
+
+            for row_num in range(row_nums):
+                ts = self.ts + self.ts_step*row_num
+                tdSql.execute(f"insert into {sub_tbname} values ({ts}, {row_num} ,{row_num}, 10 ,1 ,{row_num} ,{row_num},true,'bin_{row_num}','nchar_{row_num}',now) ")
+
+        tdLog.info(" ==== stable {} insert rows execute end =====".format(stablename))
+    
+    def append_rows_of_exists_tables(self,dbname ,stablename , tbname , append_nums ):
+        
+        tdSql.execute("use {}".format(dbname))
+     
+        for row_num in range(append_nums):
+            tdSql.execute(f"insert into {tbname} values (now, {row_num} ,{row_num}, 10 ,1 ,{row_num} ,{row_num},true,'bin_{row_num}','nchar_{row_num}',now) ")
+            # print(f"insert into {tbname} values (now, {row_num} ,{row_num}, 10 ,1 ,{row_num} ,{row_num},true,'bin_{row_num}','nchar_{row_num}',now) ")
+        tdLog.info(" ==== append new rows of table {} belongs to  stable {} execute end =====".format(tbname,stablename))
+        os.system("taos -s 'select count(*) from {}.{}';".format(dbname,stablename))
+
+    def check_insert_rows(self, dbname, stablename , tb_nums , row_nums, append_rows):
+
+        tdSql.execute("use {}".format(dbname))
+        
+        tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+
+        status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
+        
+        count = 0 
+        while not status_OK :
+            if count > self.try_check_times:
+                os.system("taos -s ' show {}.vgroups; '".format(dbname))
+                tdLog.exit(" ==== check insert rows failed  after {}  try check {} times  of database {}".format(count , self.try_check_times ,dbname))
+                break
+            time.sleep(0.1)
+            tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+            status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
+            tdLog.info(" ==== check insert rows first failed , this is {}_th retry check rows of database {}".format(count , dbname))
+            count += 1
+        
+
+        tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+        status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
+        count = 0 
+        while not status_OK :
+            if count > self.try_check_times:
+                os.system("taos -s ' show {}.vgroups;'".format(dbname))
+                tdLog.exit(" ==== check insert rows failed  after {}  try check {} times  of database {}".format(count , self.try_check_times ,dbname))
+                break
+            time.sleep(0.1)
+            tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+            status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
+            tdLog.info(" ==== check insert tbnames first failed , this is {}_th retry check tbnames of database {}".format(count , dbname))
+            count += 1
+
+    def _get_stop_dnode_id(self,dbname):
+        tdSql.query("show {}.vgroups".format(dbname))
+        vgroup_infos = tdSql.queryResult
+        for vgroup_info in vgroup_infos:
+            leader_infos = vgroup_info[3:-4] 
+            # print(vgroup_info)
+            for ind ,role in enumerate(leader_infos):
+                if role =='follower':
+                    # print(ind,leader_infos)
+                    self.stop_dnode_id = leader_infos[ind-1]
+                    break
+
+
+        return self.stop_dnode_id
+
+    def wait_stop_dnode_OK(self):
+    
+        def _get_status():
+            newTdSql=tdCom.newTdSql()
+
+            status =  ""
+            newTdSql.query("show dnodes")
+            dnode_infos = newTdSql.queryResult
+            for dnode_info in dnode_infos:
+                id = dnode_info[0]
+                dnode_status = dnode_info[4]
+                if id == self.stop_dnode_id:
+                    status = dnode_status
+                    break
+            return status 
+
+        status = _get_status()
+        while status !="offline":
+            time.sleep(0.1)
+            status = _get_status()
+            # tdLog.info("==== stop dnode has not been stopped , endpoint is {}".format(self.stop_dnode))
+        tdLog.info("==== stop_dnode has stopped , id is {}".format(self.stop_dnode_id))
+
+    def wait_start_dnode_OK(self):
+    
+        def _get_status():
+            newTdSql=tdCom.newTdSql()
+            status =  ""
+            newTdSql.query("show dnodes")
+            dnode_infos = newTdSql.queryResult
+            for dnode_info in dnode_infos:
+                id = dnode_info[0]
+                dnode_status = dnode_info[4]
+                if id == self.stop_dnode_id:
+                    status = dnode_status
+                    break
+            return status 
+
+        status = _get_status()
+        while status !="ready":
+            time.sleep(0.1)
+            status = _get_status()
+            # tdLog.info("==== stop dnode has not been stopped , endpoint is {}".format(self.stop_dnode))
+        tdLog.info("==== stop_dnode has restart , id is {}".format(self.stop_dnode_id))
+
+    def _parse_datetime(self,timestr):
+        try:
+            return datetime.datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S.%f')
+        except ValueError:
+            pass
+        try:
+            return datetime.datetime.strptime(timestr, '%Y-%m-%d %H:%M:%S')
+        except ValueError:
+            pass
+
+    def mycheckRowCol(self, sql, row, col):
+        caller = inspect.getframeinfo(inspect.stack()[2][0])
+        if row < 0:
+            args = (caller.filename, caller.lineno, sql, row)
+            tdLog.exit("%s(%d) failed: sql:%s, row:%d is smaller than zero" % args)
+        if col < 0:
+            args = (caller.filename, caller.lineno, sql, row)
+            tdLog.exit("%s(%d) failed: sql:%s, col:%d is smaller than zero" % args)
+        if row > tdSql.queryRows:
+            args = (caller.filename, caller.lineno, sql, row, tdSql.queryRows)
+            tdLog.exit("%s(%d) failed: sql:%s, row:%d is larger than queryRows:%d" % args)
+        if col > tdSql.queryCols:
+            args = (caller.filename, caller.lineno, sql, col, tdSql.queryCols)
+            tdLog.exit("%s(%d) failed: sql:%s, col:%d is larger than queryCols:%d" % args)
+
+    def mycheckData(self, sql ,row, col, data):
+        check_status = True
+        self.mycheckRowCol(sql ,row, col)
+        if tdSql.queryResult[row][col] != data:
+            if tdSql.cursor.istype(col, "TIMESTAMP"):
+                # suppose user want to check nanosecond timestamp if a longer data passed
+                if (len(data) >= 28):
+                    if pd.to_datetime(tdSql.queryResult[row][col]) == pd.to_datetime(data):
+                        tdLog.info("sql:%s, row:%d col:%d data:%d == expect:%s" %
+                            (sql, row, col, tdSql.queryResult[row][col], data))
+                else:
+                    if tdSql.queryResult[row][col] == self._parse_datetime(data):
+                        tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%s" %
+                            (sql, row, col, tdSql.queryResult[row][col], data))
+                return
+
+            if str(tdSql.queryResult[row][col]) == str(data):
+                tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%s" %
+                            (sql, row, col, tdSql.queryResult[row][col], data))
+                return
+            elif isinstance(data, float) and abs(tdSql.queryResult[row][col] - data) <= 0.000001:
+                tdLog.info("sql:%s, row:%d col:%d data:%f == expect:%f" %
+                            (sql, row, col, tdSql.queryResult[row][col], data))
+                return
+            else:
+                caller = inspect.getframeinfo(inspect.stack()[1][0])
+                args = (caller.filename, caller.lineno, sql, row, col, tdSql.queryResult[row][col], data)
+                tdLog.info("%s(%d) failed: sql:%s row:%d col:%d data:%s != expect:%s" % args)
+
+                check_status = False
+
+        if data is None:
+            tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%s" %
+                       (sql, row, col, tdSql.queryResult[row][col], data))
+        elif isinstance(data, str):
+            tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%s" %
+                       (sql, row, col, tdSql.queryResult[row][col], data))
+        elif isinstance(data, datetime.date):
+            tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%s" %
+                       (sql, row, col, tdSql.queryResult[row][col], data))
+        elif isinstance(data, float):
+            tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%s" %
+                       (sql, row, col, tdSql.queryResult[row][col], data))
+        else:
+            tdLog.info("sql:%s, row:%d col:%d data:%s == expect:%d" %
+                       (sql, row, col, tdSql.queryResult[row][col], data))
+
+        return check_status
+
+    def mycheckRows(self, sql, expectRows):
+        check_status = True
+        if len(tdSql.queryResult) == expectRows:
+            tdLog.info("sql:%s, queryRows:%d == expect:%d" % (sql, len(tdSql.queryResult), expectRows))
+            return True
+        else:
+            caller = inspect.getframeinfo(inspect.stack()[1][0])
+            args = (caller.filename, caller.lineno, sql, len(tdSql.queryResult), expectRows)
+            tdLog.info("%s(%d) failed: sql:%s, queryRows:%d != expect:%d" % args)
+            check_status = False
+        return check_status
+        
+    def sync_run_case(self):
+        # stop follower and insert datas , update tables and create new stables
+        tdDnodes=cluster.dnodes
+        for loop in range(self.loop_restart_times):
+            db_name = "sync_db_{}".format(loop)
+            stablename = 'stable_{}'.format(loop)
+            self.create_database(dbname = db_name ,replica_num= self.replica  , vgroup_nums= 1)
+            self.create_stable_insert_datas(dbname = db_name , stablename = stablename , tb_nums= 10 ,row_nums= 10 )
+            self.stop_dnode_id = self._get_stop_dnode_id(db_name)
+            
+            # check rows of datas
+            
+            self.check_insert_rows(db_name ,stablename ,tb_nums=10 , row_nums= 10 ,append_rows=0)
+        
+            # begin stop dnode 
+            start = time.time()
+            tdDnodes[self.stop_dnode_id-1].forcestop()
+        
+            self.wait_stop_dnode_OK()
+
+            # append rows of stablename when dnode stop 
+            
+            tbname = "sub_{}_{}".format(stablename , 0)
+            tdLog.info(" ==== begin  append rows of exists table {} when dnode {} offline ====".format(tbname , self.stop_dnode_id))
+            self.append_rows_of_exists_tables(db_name ,stablename , tbname , 100 )
+            tdLog.info(" ==== check  append rows of exists table {} when dnode {} offline ====".format(tbname , self.stop_dnode_id))
+            self.check_insert_rows(db_name ,stablename ,tb_nums=10 , row_nums= 10 ,append_rows=100)
+
+            # create new stables
+            tdLog.info(" ==== create new stable {} when  dnode {} offline ====".format('new_stb1' , self.stop_dnode_id))
+            self.create_stable_insert_datas(dbname = db_name , stablename = 'new_stb1' , tb_nums= 10 ,row_nums= 10 )
+            tdLog.info(" ==== check new stable {} when  dnode {} offline ====".format('new_stb1' , self.stop_dnode_id))
+            self.check_insert_rows(db_name ,'new_stb1' ,tb_nums=10 , row_nums= 10 ,append_rows=0)
+
+            # begin start dnode 
+            tdDnodes[self.stop_dnode_id-1].starttaosd()
+            self.wait_start_dnode_OK()
+            end = time.time()
+            time_cost = int(end -start)
+            if time_cost > self.max_restart_time:
+                tdLog.exit(" ==== restart dnode {} cost too much time , please check ====".format(self.stop_dnode_id))
+                
+            # create new stables again 
+            tdLog.info(" ==== create new stable {} when  dnode {} restart ====".format('new_stb2' , self.stop_dnode_id))
+            self.create_stable_insert_datas(dbname = db_name , stablename = 'new_stb2' , tb_nums= 10 ,row_nums= 10 )
+            tdLog.info(" ==== check new stable {} when  dnode {} restart ====".format('new_stb2' , self.stop_dnode_id))
+            self.check_insert_rows(db_name ,'new_stb2' ,tb_nums=10 , row_nums= 10 ,append_rows=0)
+    
+    def unsync_run_case(self):
+
+        def _restart_dnode_of_db_unsync(dbname):
+            start = time.time()
+            tdDnodes=cluster.dnodes
+            self.stop_dnode_id = self._get_stop_dnode_id(dbname)
+            while not self.stop_dnode_id:
+                time.sleep(0.5)
+                self.stop_dnode_id = self._get_stop_dnode_id(dbname)
+            # begin restart dnode
+            
+            # force stop taosd by kill -9 
+            self.force_stop_dnode(self.stop_dnode_id)
+            self.wait_stop_dnode_OK()
+            tdDnodes[self.stop_dnode_id-1].starttaosd()
+            self.wait_start_dnode_OK()
+            end = time.time()
+            time_cost = int(end-start)
+            
+            if time_cost > self.max_restart_time:
+                tdLog.exit(" ==== restart dnode {} cost too much time , please check ====".format(self.stop_dnode_id))
+            
+
+        def _create_threading(dbname):
+            self.current_thread = threading.Thread(target=_restart_dnode_of_db_unsync, args=(dbname,))
+            return self.current_thread
+            
+
+        '''
+        in this mode  , it will be extra threading control start or stop dnode  , insert will always going with not care follower online or alive 
+        '''
+        tdDnodes=cluster.dnodes
+        for loop in range(self.loop_restart_times):
+            db_name = "unsync_db_{}".format(loop)
+            stablename = 'stable_{}'.format(loop)
+            self.create_database(dbname = db_name ,replica_num= self.replica  , vgroup_nums= 1)
+            self.create_stable_insert_datas(dbname = db_name , stablename = stablename , tb_nums= 10 ,row_nums= 10 )
+
+            tdLog.info(" ===== restart dnode of database {}  in an unsync threading  ===== ".format(db_name))
+
+            # create sync threading and start it 
+            self.current_thread = _create_threading(db_name)
+            self.current_thread.start()
+
+            # check rows of datas
+            self.check_insert_rows(db_name ,stablename ,tb_nums=10 , row_nums= 10 ,append_rows=0)
+
+            tbname = "sub_{}_{}".format(stablename , 0)
+            tdLog.info(" ==== begin  append rows of exists table {} when dnode {} offline ====".format(tbname , self.stop_dnode_id))
+            self.append_rows_of_exists_tables(db_name ,stablename , tbname , 100 )
+            tdLog.info(" ==== check  append rows of exists table {} when dnode {} offline ====".format(tbname , self.stop_dnode_id))
+            self.check_insert_rows(db_name ,stablename ,tb_nums=10 , row_nums= 10 ,append_rows=100)
+
+            # create new stables
+            tdLog.info(" ==== create new stable {} when  dnode {} offline ====".format('new_stb1' , self.stop_dnode_id))
+            self.create_stable_insert_datas(dbname = db_name , stablename = 'new_stb1' , tb_nums= 10 ,row_nums= 10 )
+            tdLog.info(" ==== check new stable {} when  dnode {} offline ====".format('new_stb1' , self.stop_dnode_id))
+            self.check_insert_rows(db_name ,'new_stb1' ,tb_nums=10 , row_nums= 10 ,append_rows=0)
+
+            # create new stables again 
+            tdLog.info(" ==== create new stable {} when  dnode {} restart ====".format('new_stb2' , self.stop_dnode_id))
+            self.create_stable_insert_datas(dbname = db_name , stablename = 'new_stb2' , tb_nums= 10 ,row_nums= 10 )
+            tdLog.info(" ==== check new stable {} when  dnode {} restart ====".format('new_stb2' , self.stop_dnode_id))
+            self.check_insert_rows(db_name ,'new_stb2' ,tb_nums=10 , row_nums= 10 ,append_rows=0)
+
+            self.current_thread.join()
+
+    def force_stop_dnode(self, dnode_id ):
+
+        tdSql.query("show dnodes")
+        port = None
+        for dnode_info in tdSql.queryResult:
+            if dnode_id == dnode_info[0]:
+                port = dnode_info[1].split(":")[-1] 
+                break
+            else:
+                continue
+        if port:
+            tdLog.info(" ==== dnode {} will be force stop by kill -9 ====".format(dnode_id))
+            psCmd = '''netstat -anp|grep -w LISTEN|grep -w %s |grep -o "LISTEN.*"|awk '{print $2}'|cut -d/ -f1|head -n1''' %(port)
+            processID = subprocess.check_output(
+                psCmd, shell=True).decode("utf-8")
+            ps_kill_taosd = ''' kill -9 {} '''.format(processID)
+            # print(ps_kill_taosd)
+            os.system(ps_kill_taosd)
+
+
+    def run(self): 
+
+        # basic insert and check of cluster
+        self.check_setup_cluster_status()
+        self.create_db_check_vgroups()
+        # self.sync_run_case()
+        self.unsync_run_case()
+
+        
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_leader.py b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_leader.py
index d326a2313706053263313e0c29923876d4a7a39d..47f0ffb61f7386d46bc518c010878bafbfa37d2b 100644
--- a/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_leader.py
+++ b/tests/system-test/6-cluster/vnode/4dnode1mnode_basic_replica3_insertdatas_stop_leader.py
@@ -262,21 +262,32 @@ class TDTestCase:
         
         tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
 
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+
         status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
         
         count = 0 
         while not status_OK :
             if count > self.try_check_times:
-                os.system("taos -s ' show {}.vgroups;'".format(dbname))
+                os.system("taos -s ' show {}.vgroups; '".format(dbname))
                 tdLog.exit(" ==== check insert rows failed  after {}  try check {} times  of database {}".format(count , self.try_check_times ,dbname))
                 break
             time.sleep(0.1)
             tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select count(*) from {}.{}".format(dbname,stablename))
             status_OK = self.mycheckData("select count(*) from {}.{}".format(dbname,stablename) ,0 , 0 , tb_nums*row_nums+append_rows)
             tdLog.info(" ==== check insert rows first failed , this is {}_th retry check rows of database {}".format(count , dbname))
             count += 1
         
+
         tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+        while not tdSql.queryResult:
+            time.sleep(0.1)
+            tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
         status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
         count = 0 
         while not status_OK :
@@ -286,10 +297,12 @@ class TDTestCase:
                 break
             time.sleep(0.1)
             tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
+            while not tdSql.queryResult:
+                time.sleep(0.1)
+                tdSql.query("select distinct tbname from {}.{}".format(dbname,stablename))
             status_OK = self.mycheckRows("select distinct tbname from {}.{}".format(dbname,stablename) ,tb_nums)
             tdLog.info(" ==== check insert tbnames first failed , this is {}_th retry check tbnames of database {}".format(count , dbname))
             count += 1
-
     def _get_stop_dnode_id(self,dbname):
         newTdSql=tdCom.newTdSql()
         newTdSql.query("show {}.vgroups".format(dbname))