diff --git a/tests/pytest/alter/alter_keep.py b/tests/pytest/alter/alter_keep.py
new file mode 100644
index 0000000000000000000000000000000000000000..e7c58a09c5e5384dc4e7a9a4d88ce7b7ad97178a
--- /dev/null
+++ b/tests/pytest/alter/alter_keep.py
@@ -0,0 +1,70 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+
+    def run(self):
+        tdSql.prepare()
+        tdSql.execute('create table tb (ts timestamp, speed int)')
+
+        tdSql.query('show databases')
+        tdSql.checkData(0,7,'3650,3650,3650')
+        tdSql.execute('alter database db keep 10')
+        tdSql.query('show databases')
+        tdSql.checkData(0,7,'10,10,10')
+        tdSql.execute('alter database db keep 50')
+        tdSql.query('show databases')
+        tdSql.checkData(0,7,'50,50,50')
+        tdSql.error('alter database db keep !)') 
+
+        ##TODO: test the illegal alter keep input where input < days
+        # tdSql.error('alter database db keep -10')
+        # tdSql.error('alter database db keep 0')
+
+        ##TODO: test keep keep hot alter, cannot be tested for now as test.py's output
+        ##      is inconsistent with the actual output.
+                    
+        # tdSql.execute('insert into tb values (now, 10)')
+        # tdSql.execute('insert into tb values (now + 10m, 10)')
+        # tdSql.query('select * from tb')
+        # tdSql.checkRows(2)
+        # tdSql.execute('alter database db keep 40,40,40')
+        # os.system('systemctl restart taosd')
+        # tdSql.execute('insert into tb values (now-60d, 10)')
+        # tdSql.execute('insert into tb values (now-30d, 10)')
+        # tdSql.query('select * from tb')
+        # tdSql.showQueryResult()
+        # tdSql.checkRows(2)
+        # tdSql.execute('alter database db keep 20,20,20')
+        # tdSql.checkRows(3)
+        # os.system('systemctl restart taosd')
+        # tdSql.query('select * from tb')
+        # tdSql.checkRows(2)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index c93fbc5eb3803a22b7a8bc99fe420bab3fb3f0c2..a546c74da61bf1e9744c90d3240906316f41bfbd 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -335,5 +335,5 @@ python3 ./test.py -f tag_lite/alter_tag.py
 python3 test.py -f tools/taosdemoAllTest/taosdemoTestInsertWithJson.py 
 python3 test.py -f tools/taosdemoAllTest/taosdemoTestQueryWithJson.py
 python3 test.py -f insert/insert_before_use_db.py
-
+python3 test.py -f alter/alter_keep.py
 #======================p4-end===============