diff --git a/tests/pytest/concurrent_inquiry.py b/tests/pytest/concurrent_inquiry.py
new file mode 100644
index 0000000000000000000000000000000000000000..faefc8a1c296c10e8b4fc18c2e72a6b0ff8fda44
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+++ b/tests/pytest/concurrent_inquiry.py
@@ -0,0 +1,146 @@
+###################################################################
+#           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 threading
+import taos
+
+import json
+import time
+import random
+# query sql
+query_sql = [
+# first supertable
+"select count(*) from test.meters where c1 > 50;",
+"select count(*) from test.meters where c2 >= 50 and c2 < 100;",
+"select count(*) from test.meters where c3 != 5;",
+"select count(*) from test.meters where t3 > 2;",
+"select count(*) from test.meters where ts <> '2020-05-13 10:00:00.002';",
+"select count(*) from test.meters where t7 like 'fi%';",
+"select count(*) from test.meters where t7 like '_econd';",
+"select count(*) from test.meters interval(1n) order by ts desc;",
+"select first(*)  from test.meters;",
+"select last(*)  from test.meters;",
+"select last_row(*)  from test.meters;",
+"select twa(c1) from test.t1 where ts > 1500000001000  and ts < 1500000101000" ,
+"select avg(c1) from test.meters;",
+"select bottom(c1, 2) from test.t1;",
+"select diff(c1) from test.t1;",
+"select leastsquares(c1, 1, 1) from test.t1  ;",
+"select max(c1) from test.meters;",
+"select min(c1) from test.meters;",
+"select c1 + c2 * c3 + c1 / c5 + c4 + c2 from test.t1;",
+"select percentile(c1, 50) from test.t1;",
+"select spread(c1) from test.t1  ;",
+"select stddev(c1) from test.t1;",
+"select sum(c1) from test.meters;",
+"select top(c1, 2) from test.meters;"
+"select twa(c6) from test.t1 where ts > 1500000001000  and ts < 1500000101000" ,
+"select avg(c6) from test.meters;",
+"select bottom(c6, 2) from test.t1;",
+"select diff(c6) from test.t1;",
+"select leastsquares(c6, 1, 1) from test.t1  ;",
+"select max(c6) from test.meters;",
+"select min(c6) from test.meters;",
+"select c6 + c2 * c3 + c6 / c5 + c4 + c2 from test.t1;",
+"select percentile(c6, 50) from test.t1;",
+"select spread(c6) from test.t1  ;",
+"select stddev(c6) from test.t1;",
+"select sum(c6) from test.meters;",
+"select top(c6, 2) from test.meters;",
+# second supertable
+"select count(*) from test.meters1 where c1 > 50;",
+"select count(*) from test.meters1 where c2 >= 50 and c2 < 100;",
+"select count(*) from test.meters1 where c3 != 5;",
+"select count(*) from test.meters1 where t3 > 2;",
+"select count(*) from test.meters1 where ts <> '2020-05-13 10:00:00.002';",
+"select count(*) from test.meters1 where t7 like 'fi%';",
+"select count(*) from test.meters1 where t7 like '_econd';",
+"select count(*) from test.meters1 interval(1n) order by ts desc;",
+"select first(*)  from test.meters1;",
+"select last(*)  from test.meters1;",
+"select last_row(*)  from test.meters1;",
+"select twa(c1) from test.m1 where ts > 1500000001000  and ts < 1500000101000" ,
+"select avg(c1) from test.meters1;",
+"select bottom(c1, 2) from test.m1;",
+"select diff(c1) from test.m1;",
+"select leastsquares(c1, 1, 1) from test.m1  ;",
+"select max(c1) from test.meters1;",
+"select min(c1) from test.meters1;",
+"select c1 + c2 * c3 + c1 / c5 + c3 + c2 from test.m1;",
+"select percentile(c1, 50) from test.m1;",
+"select spread(c1) from test.m1  ;",
+"select stddev(c1) from test.m1;",
+"select sum(c1) from test.meters1;",
+"select top(c1, 2) from test.meters1;",
+"select twa(c6) from test.m1 where ts > 1500000001000  and ts < 1500000101000" ,
+"select avg(c6) from test.meters1;",
+"select bottom(c6, 2) from test.m1;",
+"select diff(c6) from test.m1;",
+"select leastsquares(c6, 1, 1) from test.m1  ;",
+"select max(c6) from test.meters1;",
+"select min(c6) from test.meters1;",
+"select c6 + c2 * c3 + c6 / c5 + c3 + c2 from test.m1;",
+"select percentile(c6, 50) from test.m1;",
+"select spread(c6) from test.m1  ;",
+"select stddev(c6) from test.m1;",
+"select sum(c6) from test.meters1;",
+"select top(c6, 2) from test.meters1;"
+]
+
+class ConcurrentInquiry:
+    def initConnection(self):  
+        self.numOfTherads = 50
+        self.ts=1500000001000
+        
+
+    def query_thread(self,threadID):
+        host = "10.211.55.14"
+        user = "root"
+        password = "taosdata"
+        conn = taos.connect(
+            host,
+            user,
+            password,
+            )
+        cl = conn.cursor()
+        
+        print("Thread %d: starting" % threadID)
+        
+        while True:
+            ran_query_sql=query_sql
+            random.shuffle(ran_query_sql)
+            for i in ran_query_sql:
+                print("Thread %d : %s"% (threadID,i))
+                try:
+                    cl.execute(i)
+                    cl.fetchall
+                except Exception as e:
+                    print(
+                "Failure thread%d, sql: %s,exception: %s" %
+                (threadID, str(i),str(e)))
+                    
+                
+            print("Thread %d: finishing" % threadID)
+          
+        
+
+    def run(self):
+       
+        threads = []
+        for i in range(50):
+            thread = threading.Thread(target=self.query_thread, args=(i,))
+            threads.append(thread)
+            thread.start()  
+        
+q = ConcurrentInquiry()
+q.initConnection()
+q.run()