diff --git a/tests/pytest/alter/alter_debugFlag.py b/tests/pytest/alter/alter_debugFlag.py
new file mode 100644
index 0000000000000000000000000000000000000000..38d972b58252a704420af0dda7c091c22c894ecd
--- /dev/null
+++ b/tests/pytest/alter/alter_debugFlag.py
@@ -0,0 +1,54 @@
+###################################################################
+#           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
+import random
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import tdDnodes
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+        
+        flagList=["debugflag", "cdebugflag", "tmrDebugFlag", "uDebugFlag", "rpcDebugFlag"]
+
+        for flag in flagList:
+            tdSql.execute("alter local %s 131" % flag)
+            tdSql.execute("alter local %s 135" % flag)
+            tdSql.execute("alter local %s 143" % flag)
+            randomFlag = random.randint(100, 250)
+            if randomFlag != 131 and randomFlag != 135 and randomFlag != 143:
+                tdSql.error("alter local %s %d" % (flag, randomFlag))
+        
+        tdSql.query("show dnodes")
+        dnodeId = tdSql.getData(0, 0)
+
+        for flag in flagList:
+            tdSql.execute("alter dnode %d %s 131" % (dnodeId, flag))
+            tdSql.execute("alter dnode %d %s 135" % (dnodeId, flag))
+            tdSql.execute("alter dnode %d %s 143" % (dnodeId, flag)) 
+
+    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 aee8f7502c354628d9cb0ca9df55ab4a7ad17c6f..9c5ee6aae0e925ef36c17bd7418a2ad7f7e319f0 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -193,6 +193,7 @@ python3 ./test.py -f stream/table_n.py
 #alter table
 python3 ./test.py -f alter/alter_table_crash.py
 python3 ./test.py -f alter/alter_table.py
+python3 ./test.py -f alter/alter_debugFlag.py
 
 # client
 python3 ./test.py -f client/client.py