diff --git a/tests/pytest/client/change_time_1_1.py b/tests/pytest/client/change_time_1_1.py
index 24e0195a9c020c793f3e82f45029d8e24199f50b..abae49a41f32aeb482a3eb8b06ff4485ec7757e9 100644
--- a/tests/pytest/client/change_time_1_1.py
+++ b/tests/pytest/client/change_time_1_1.py
@@ -51,7 +51,8 @@ class TDTestCase:
         #move 5 days ahead to 2020/10/25. 4 oldest files should be removed during the new write
         #leaving 7 data files.
         os.system ('timedatectl set-time 2020-10-25')
-        os.system(f"{binPath}taosdemo -f tools/taosdemoAllTest/manual_change_time_1_1_B.json") 
+        os.system(f"{binPath}taosdemo -f tools/taosdemoAllTest/manual_change_time_1_1_B.json")
+        os.system('sudo timedatectl set-ntp on') 
         commandArray = ['ls', '-l', f'{TDenginePath}/sim/dnode1/data/vnode/vnode2/tsdb/data']
         result = subprocess.run(commandArray, stdout=subprocess.PIPE).stdout.decode('utf-8')
         print(result.count('data'))
@@ -61,6 +62,7 @@ class TDTestCase:
             tdLog.debug("data file number correct")
         tdSql.query('select first(ts) from stb_0')
         tdSql.checkData(0,0,datetime(2020,10,14,8,0,0,0)) #check the last data in the database
+        os.system('sudo timedatectl set-ntp on')
 
     def stop(self):
         os.system('sudo timedatectl set-ntp on')
diff --git a/tests/pytest/client/change_time_1_2.py b/tests/pytest/client/change_time_1_2.py
index cd1a17926da89ebb6d0f67bbe5f818f763a1ea0e..855b04873c172682f7c869487ee6a254e1f36787 100644
--- a/tests/pytest/client/change_time_1_2.py
+++ b/tests/pytest/client/change_time_1_2.py
@@ -62,6 +62,7 @@ class TDTestCase:
         tdDnodes.start(1)
         tdSql.query('select first(ts) from stb_0')
         tdSql.checkData(0,0,datetime(2020,10,14,8,0,0,0)) #check the last data in the database
+        os.system('sudo timedatectl set-ntp on')
         commandArray = ['ls', '-l', f'{TDenginePath}/sim/dnode1/data/vnode/vnode2/tsdb/data']
         result = subprocess.run(commandArray, stdout=subprocess.PIPE).stdout.decode('utf-8')
         print(result.count('data'))
@@ -69,8 +70,7 @@ class TDTestCase:
             tdLog.exit('wrong number of files')
         else:
             tdLog.debug("data file number correct")
-
-
+        os.system('sudo timedatectl set-ntp on')
 
     def stop(self):
         os.system('sudo timedatectl set-ntp on')
diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index fe023acc4b69adfb30c8083cb521e93e0574667a..bab56fa657ae1c6635f9636f75878f61c6d9f7c9 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -256,8 +256,6 @@ python3 ./test.py -f client/client.py
 python3 ./test.py -f client/version.py
 python3 ./test.py -f client/alterDatabase.py
 python3 ./test.py -f client/noConnectionErrorTest.py
-python3 test.py -f client/change_time_1_1.py
-python3 test.py -f client/change_time_1_2.py
 
 # Misc
 python3 testCompress.py
@@ -344,4 +342,6 @@ python3 test.py -f alter/alter_keep.py
 python3 test.py -f alter/alter_cacheLastRow.py
 python3 ./test.py -f query/querySession.py 
 python3 test.py -f  alter/alter_create_exception.py
+python3 test.py -f client/change_time_1_1.py
+python3 test.py -f client/change_time_1_2.py
 #======================p4-end===============