diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index 1a8745d7ceacfd49d9b67acb7481441c333f0bce..b5aae6fcefba1a3cfb74f3f19be7c2f2855fb566 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -226,6 +226,7 @@ python3 ./test.py -f query/querySecondtscolumnTowherenow.py
 python3 ./test.py -f query/queryFilterTswithDateUnit.py
 python3 ./test.py -f query/queryTscomputWithNow.py
 python3 ./test.py -f query/computeErrorinWhere.py
+python3 ./test.py -f query/queryTsisNull.py
 
 
 
diff --git a/tests/pytest/query/queryTsisNull.py b/tests/pytest/query/queryTsisNull.py
new file mode 100644
index 0000000000000000000000000000000000000000..df783f2fb86ab600ac579093a391d88cfd9370c5
--- /dev/null
+++ b/tests/pytest/query/queryTsisNull.py
@@ -0,0 +1,53 @@
+###################################################################
+#           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 *
+from util.dnodes 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("drop database if exists db")
+        tdSql.execute("create database  if not exists db keep 3650")
+        tdSql.execute("use db")
+
+        tdLog.printNoPrefix("==========step1:create table and insert data")
+        tdSql.execute(
+            "create table stb1 (ts timestamp, c1 timestamp , c2 int) TAGS(t1 int )"
+        )
+
+        tdLog.printNoPrefix("==========step2:query data where timestamp data is null")
+        tdSql.execute(
+            "insert into t1 using stb1(t1) tags(1) (ts, c1, c2) values (now-1m, null, 1)"
+        )
+        tdSql.execute(
+            "insert into t1 using stb1(t1) tags(1) (ts, c2) values (now-2m, 2)"
+        )
+        tdSql.query("select * from t1 where c1 is NULL")
+        tdSql.checkRows(2)
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())