diff --git a/tests/pytest/query/queryPerformance.py b/tests/pytest/query/queryPerformance.py
index 720ae745cb9b3780f1ca7ffaf96d76eda5f307b1..f3e8fed24ce1bcc42c86bfa1fbe09b8edf6fda95 100644
--- a/tests/pytest/query/queryPerformance.py
+++ b/tests/pytest/query/queryPerformance.py
@@ -45,28 +45,39 @@ class taosdemoQueryPerformace:
         sql = "select count(*) from test.meters"
         tableid = 1
         cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select avg(f1), max(f2), min(f3) from test.meters"
         tableid = 2
         cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select count(*) from test.meters where loc='beijing'"
         tableid = 3
         cursor.execute("create table if not exists %s%d using %s tags(%d, \"%s\")" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select avg(f1), max(f2), min(f3) from test.meters where areaid=10"
         tableid = 4
         cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select avg(f1), max(f2), min(f3) from test.t10 interval(10s)"
         tableid = 5
         cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select last_row(*) from meters"
         tableid = 6
         cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select * from meters"
         tableid = 7
         cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+        
         sql = "select avg(f1), max(f2), min(f3) from meters where ts <= '2017-07-15 10:40:01.000' and ts <= '2017-07-15 14:00:40.000'"
         tableid = 8
         cursor.execute("create table if not exists %s%d using %s tags(%d, \"%s\")" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
 
+        sql = "select last(*) from meters"
+        tableid = 9
+        cursor.execute("create table if not exists %s%d using %s tags(%d, '%s')" % (self.tbPerfix, tableid, self.stbName, tableid, sql))
+
         cursor.close()
 
     def query(self): 
diff --git a/tests/pytest/tools/taosdemoPerformance.py b/tests/pytest/tools/taosdemoPerformance.py
index c4b125969a7aae7735f29fe9429d029673588d21..f5eaec0ee6d69aa85bd6a3b6f5295a0c931b8ab5 100644
--- a/tests/pytest/tools/taosdemoPerformance.py
+++ b/tests/pytest/tools/taosdemoPerformance.py
@@ -16,7 +16,8 @@ import pandas as pd
 import argparse
 import os.path
 import json
-
+from util.log import tdLog
+from util.sql import tdSql
 
 class taosdemoPerformace:
     def __init__(self, commitID, dbName):
@@ -121,7 +122,6 @@ class taosdemoPerformace:
         return buildPath
 
     def insertData(self):
-        tdSql.prepare()
         buildPath = self.getBuildPath()
         if (buildPath == ""):
             tdLog.exit("taosdemo not found!")