diff --git a/tests/system-test/2-query/9-others/TD-11943.py b/tests/system-test/2-query/9-others/TD-11943.py
new file mode 100644
index 0000000000000000000000000000000000000000..d8f8aec2a8235ee5d2b80031a280c5022f6d7703
--- /dev/null
+++ b/tests/system-test/2-query/9-others/TD-11943.py
@@ -0,0 +1,71 @@
+###################################################################
+#           Copyright (c) 2020 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 -*-
+
+from posixpath import split
+import sys
+import os 
+
+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)
+        
+        self.ts = 1420041600000 # 2015-01-01 00:00:00  this is begin time for first record
+        self.num = 10
+
+    def caseDescription(self):
+
+        '''
+        case1 <authors>: wenzhouwww[TD-11943] : 
+            this test case is an test case for unexpected coredump about taosd ;
+            root cause : the pExpr2 of sql select tbname, max(col)+5 from child_table has two functions, col_proj and scalar_expr.
+            for function col_proj (tbname column), it is a tag during master scan stage, the input data is not set. 
+
+        ''' 
+        return 
+
+   
+    def run(self):
+        tdSql.prepare()
+        tdSql.execute("create database if not exists testdb keep 36500;")
+        tdSql.execute("use testdb;")
+        tdSql.execute("create stable st (ts timestamp , id int , value double) tags(hostname binary(10) ,ind int);")
+        for i in range(self.num):
+            tdSql.execute("insert into sub_%s using st tags('host_%s' , %d) values (%d , %d , %f );"%(str(i),str(i),i*10,self.ts+10000*i,i*2,i+10.00))
+
+        tdSql.query("select tbname ,max(value) from st;")
+        tdSql.checkRows(1)
+        tdSql.checkData(0,1,19)
+        tdSql.query("select tbname ,max(value)+5 from st;")
+        tdSql.checkRows(1)
+        tdSql.checkData(0,1,24)
+        tdSql.query("select tbname ,max(value) from sub_1;")
+        tdSql.checkRows(1)
+        tdSql.checkData(0,1,11)
+        tdSql.query("select tbname ,max(value)+5 from sub_1;")
+        tdSql.checkRows(1)
+        tdSql.checkData(0,1,16)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
+
+
diff --git a/tests/system-test/fulltest.sh b/tests/system-test/fulltest.sh
index 222241d65ce8c8feaf4dd68113eba41eaa069602..46881b3319776dd76dac34523f70f5513aba3f82 100755
--- a/tests/system-test/fulltest.sh
+++ b/tests/system-test/fulltest.sh
@@ -2,5 +2,8 @@ python3 test.py -f 0-management/1-stable/create_col_tag.py
 python3 test.py -f 4-taosAdapter/taosAdapter_query.py
 python3 test.py -f 4-taosAdapter/taosAdapter_insert.py
 
+
+
+python3 test.py -f  2-query/9-others/TD-11943.py
 #python3 test.py -f 2-query/9-others/TD-11389.py # this case will run when this bug fix  TD-11389
-python3 test.py -f 5-taos-tools/taosdump/basic.py 
\ No newline at end of file
+python3 test.py -f 5-taos-tools/taosdump/basic.py