diff --git a/tests/pytest/cq.py b/tests/pytest/cq.py
new file mode 100644
index 0000000000000000000000000000000000000000..c35ac4806c75c93aaf528fec02419d4029f9243c
--- /dev/null
+++ b/tests/pytest/cq.py
@@ -0,0 +1,187 @@
+###################################################################
+#           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 sys
+import json
+import time
+import random
+# query sql
+query_sql = [
+]
+func_list=['avg','count','twa','sum','stddev','leastsquares','min',
+'max','first','last','top','bottom','percentile','apercentile',
+'last_row','diff','spread']
+condition_list=[
+    "where _c0 > now -10d ",
+    'interval(10s)',
+    'limit 10',
+    'group by',
+    'order by',
+    'fill(null)'
+    
+]
+class ConcurrentInquiry:
+    def initConnection(self):  
+        self.numOfTherads = 50
+        self.ts=1500000001000
+        self.dbname='test'
+        self.stb_list=[]
+        self.subtb_list=[]
+        self.stb_stru_list=[]
+        self.subtb_stru_list=[]
+        self.stb_tag_list=[]
+        self.subtb_tag_list=[]
+    def SetThreadsNum(self,num):
+        self.numOfTherads=num
+    def ret_fcol(self,cl,sql):                     #返回结果的第一列
+        cl.execute(sql)
+        fcol_list=[]
+        for data in cl:
+            fcol_list.append(data[0])
+        return fcol_list
+    def r_stb_list(self,cl):
+        sql='show '+self.dbname+'.stables'
+        self.stb_list=self.ret_fcol(cl,sql)
+    def r_subtb_list(self,cl,stablename):
+        sql='select tbname from '+self.dbname+'.'+stablename+' limit 2;'
+        self.subtb_list+=self.ret_fcol(cl,sql)
+    def cal_struct(self,cl,tbname):
+        tb=[]
+        tag=[]
+        sql='describe '+self.dbname+'.'+tbname+';'
+        cl.execute(sql)
+        for data in cl:
+            if data[3]:
+                tag.append(data[0])
+            else:
+                tb.append(data[0])
+        return tb,tag
+    def r_stb_stru(self,cl):
+        for i in self.stb_list:
+            tb,tag=self.cal_struct(cl,i)
+            self.stb_stru_list.append(tb)
+            self.stb_tag_list.append(tag)
+    def r_subtb_stru(self,cl):
+        for i in self.subtb_list:
+            tb,tag=self.cal_struct(cl,i)
+            self.subtb_stru_list.append(tb)
+            self.subtb_tag_list.append(tag)
+    def get_full(self):
+        host = "127.0.0.1"
+        user = "root"
+        password = "taosdata"
+        conn = taos.connect(
+            host,
+            user,
+            password,
+            )
+        cl = conn.cursor()
+        self.r_stb_list(cl)
+        for i in self.stb_list:
+            self.r_subtb_list(cl,i)
+        self.r_stb_stru(cl)
+        self.r_subtb_stru(cl)
+        #print(self.stb_list,self.subtb_list,self.stb_stru_list,self.stb_tag_list,self.subtb_stru_list,self.subtb_tag_list)
+        cl.close()
+        conn.close()   
+    def gen_query_sql(self):
+        tbi=random.randint(0,len(self.subtb_list)+len(self.stb_list))
+        tbname=''
+        col_list=[]
+        tag_list=[]
+        is_stb=0
+        if tbi>len(self.stb_list) :
+            tbi=tbi-len(self.stb_list)
+            tbname=self.subtb_list[tbi-1]
+            col_list=self.subtb_stru_list[tbi-1]
+            tag_list=self.subtb_tag_list[tbi-1]
+        else:
+            tbname=self.stb_list[tbi-1]
+            col_list=self.stb_stru_list[tbi-1]
+            tag_list=self.stb_tag_list[tbi-1]
+            is_stb=1
+        tlist=col_list+tag_list
+        con_rand=random.randint(0,len(condition_list))
+        func_rand=random.randint(0,len(func_list))
+        col_rand=random.randint(0,len(col_list))
+        tag_rand=random.randint(0,len(tag_list))
+        t_rand=random.randint(0,len(tlist))
+        sql='select 1'
+        random.shuffle(col_list)
+        for i in col_list[0:col_rand]:
+            if func_list[func_rand-1] == 'leastsquares':
+                sql+=','+func_list[func_rand-1]+'('+i+',1,1)'
+            elif func_list[func_rand-1] == 'top' or func_list[func_rand-1] == 'bottom' or func_list[func_rand-1] == 'percentile' or func_list[func_rand-1] == 'apercentile':
+                sql+=','+func_list[func_rand-1]+'('+i+',1)'
+            else:
+                sql+=','+func_list[func_rand-1]+'('+i+')'
+        sql+=' from '+tbname
+        if condition_list[con_rand-1].startswith('w'):
+            sql+=' '+condition_list[con_rand-1]+'and '+tlist[t_rand-1]+'>20'
+        elif condition_list[con_rand-1].startswith('o'):
+            sql+=' '+condition_list[con_rand-1]+' '+tlist[t_rand-1]
+        elif condition_list[con_rand-1].startswith('g'):
+            sql+=' '+condition_list[con_rand-1]+' '+tlist[t_rand-1]
+        else :
+            sql+=' '+condition_list[con_rand-1]
+        return sql
+    def query_thread(self,threadID):
+        host = "127.0.0.1"
+        user = "root"
+        password = "taosdata"
+        conn = taos.connect(
+            host,
+            user,
+            password,
+            )
+        cl = conn.cursor()
+        cl.execute("use test;")
+        
+        print("Thread %d: starting" % threadID)
+        
+        while True:
+            
+                try:
+                    sql=self.gen_query_sql()
+                    print("sql is ",sql)
+                    start = time.time()
+                    cl.execute(sql)
+                    cl.fetchall()
+                    end = time.time()
+                    print("time cost :",end-start)
+                except Exception as e:
+                    print(
+                "Failure thread%d, sql: %s,exception: %s" %
+                (threadID, str(sql),str(e)))
+                    #exit(-1)
+                    
+                
+        print("Thread %d: finishing" % threadID)
+          
+        
+
+    def run(self):
+            
+        threads = []
+        for i in range(self.numOfTherads):
+            thread = threading.Thread(target=self.query_thread, args=(i,))
+            threads.append(thread)
+            thread.start()  
+        
+q = ConcurrentInquiry()
+q.initConnection()
+q.get_full()
+#q.gen_query_sql()
+q.run()
+