diff --git a/tests/pytest/client/change_time_1_1.py b/tests/pytest/client/change_time_1_1.py
index 1744c09132..acdea17fbf 100644
--- a/tests/pytest/client/change_time_1_1.py
+++ b/tests/pytest/client/change_time_1_1.py
@@ -35,6 +35,7 @@ class TDTestCase:
 
         ## change system time to 2020/10/20
         os.system('sudo timedatectl set-ntp off')
+        tdLog.sleep(10)
         os.system('sudo timedatectl set-time 2020-10-20')
 
         #run taosdemo to insert data. one row per second from 2020/10/11 to 2020/10/20
diff --git a/tests/pytest/client/change_time_1_2.py b/tests/pytest/client/change_time_1_2.py
index 76400885f8..ec483b00be 100644
--- a/tests/pytest/client/change_time_1_2.py
+++ b/tests/pytest/client/change_time_1_2.py
@@ -34,6 +34,7 @@ class TDTestCase:
 
         ## change system time to 2020/10/20
         os.system ('timedatectl set-ntp off')
+        tdLog.sleep(10)
         os.system ('timedatectl set-time 2020-10-20')
 
         #run taosdemo to insert data. one row per second from 2020/10/11 to 2020/10/20
diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index e8b369e0cd..1a7a0b64ee 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -257,8 +257,8 @@ 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
+python3 test.py -f client/change_time_1_1.py
+python3 test.py -f client/change_time_1_2.py
 
 # Misc
 python3 testCompress.py
@@ -342,10 +342,8 @@ python3 test.py -f tools/taosdemoAllTest/taosdemoTestInsertWithJson.py
 python3 test.py -f tools/taosdemoAllTest/taosdemoTestQueryWithJson.py
 python3 ./test.py -f tag_lite/drop_auto_create.py
 python3 test.py -f insert/insert_before_use_db.py
-#python3 test.py -f alter/alter_keep.py
+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===============