diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index a93a98a145fb8984903001ef0569cf35ac3f3a99..e9dc3762fe9aed0eac8e7e7d70356ba3baa5a450 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -317,7 +317,6 @@ python3 ./test.py -f query/last_row_cache.py
 python3 ./test.py -f account/account_create.py
 python3 ./test.py -f alter/alter_table.py
 python3 ./test.py -f query/queryGroupbySort.py
-python3 ./test.py -f functions/function_session.py
 python3 ./test.py -f functions/function_stateWindow.py
 
 python3 ./test.py -f insert/unsignedInt.py
@@ -344,4 +343,5 @@ python3 test.py -f insert/insert_before_use_db.py
 python3 test.py -f alter/alter_keep.py
 python3 test.py -f alter/alter_cacheLastRow.py
 python3 test.py -f alter/alter_keep_exception.py
+python3 ./test.py -f query/querySession.py 
 #======================p4-end===============
diff --git a/tests/pytest/functions/function_session.py b/tests/pytest/functions/function_session.py
deleted file mode 100644
index 21b6d088ffd45c3a0e1b867335b8a36d834b93cc..0000000000000000000000000000000000000000
--- a/tests/pytest/functions/function_session.py
+++ /dev/null
@@ -1,86 +0,0 @@
-###################################################################
-#           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 taos
-from util.log import *
-from util.cases import *
-from util.sql import *
-#import numpy as np
-
-
-class TDTestCase:
-    def init(self, conn, logSql):
-        tdLog.debug("start to execute %s" % __file__)
-        tdSql.init(conn.cursor())
-
-        self.rowNum = 10
-        self.ts = 1537146000000
-        
-    def run(self):
-        tdSql.prepare()
-
-        tdSql.execute('''create table test(ts timestamp, col1 tinyint, col2 smallint, col3 int, col4 bigint, col5 float, col6 double, 
-                    col7 bool, col8 binary(20), col9 nchar(20), col11 tinyint unsigned, col12 smallint unsigned, col13 int unsigned, col14 bigint unsigned) tags(loc nchar(20))''')
-        tdSql.execute("create table test1 using test tags('beijing')")
-        for i in range(self.rowNum):
-            tdSql.execute("insert into test1 values(%d, %d, %d, %d, %d, %f, %f, %d, 'taosdata%d', '涛思数据%d', %d, %d, %d, %d)" 
-                        % (self.ts + i, i + 1, i + 1, i + 1, i + 1, i + 0.1, i + 0.1, i % 2, i + 1, i + 1, i + 1, i + 1, i + 1, i + 1))
-
-        # operation not allowed on super table
-        tdSql.error("select count(*) from test session(ts, 1s)")
-        # operation not allowde on col pro
-        tdSql.error("select * from test1 session(ts, 1s)")
-        # operation not allowed on col except primary ts 
-        tdSql.error("select * from test1 session(col1, 1s)")
-
-        tdSql.query("select count(*) from test1 session(ts, 1s)")  
-
-        tdSql.checkRows(1)
-        tdSql.checkData(0, 1, 10)
-        # append more data
-
-        for i in range(self.rowNum):
-          tdSql.execute("insert into test1 values(%d, %d, %d, %d, %d, %f, %f, %d, 'taosdata%d', '涛思数据%d', %d, %d, %d, %d)" 
-              % (self.ts + 2000, i + 1, i + 1, i + 1, i + 1, i + 0.1, i + 0.1, i % 2, i + 1, i + 1, i + 1, i + 1, i + 1, i + 1))
-
-        tdSql.query("select count(*) from test1 session(ts, 1s)")  
-        tdSql.checkRows(2)
-        tdSql.checkData(0, 1, 10)
-        tdSql.checkData(1, 1, 1)
-
-        tdSql.query("select count(*) from test1 session(ts, 1m)")  
-        tdSql.checkRows(1)
-        tdSql.checkData(0, 1, 11)
-
-        tdSql.query("select first(col1) from test1 session(ts, 1s)")  
-        tdSql.checkRows(2)
-        tdSql.checkData(0, 1, 1)
-        tdSql.checkData(1, 1, 1)
-
-
-        tdSql.query("select first(col1), last(col2) from test1 session(ts, 1s)")  
-        tdSql.checkRows(2)
-        tdSql.checkData(0, 1, 1)
-        tdSql.checkData(0, 2, 10)
-        tdSql.checkData(1, 1, 1)
-        tdSql.checkData(1, 1, 1)
-         
-        # add more function
-        
-    def stop(self):
-        tdSql.close()
-        tdLog.success("%s successfully executed" % __file__)
-
-tdCases.addWindows(__file__, TDTestCase())
-tdCases.addLinux(__file__, TDTestCase())
diff --git a/tests/pytest/query/querySession.py b/tests/pytest/query/querySession.py
index 9c8fc747dfbdbb07561a13a27257cc3bab1a2df3..53d53e2b02efbcc1212f8ef64f3b89a9cce03e13 100644
--- a/tests/pytest/query/querySession.py
+++ b/tests/pytest/query/querySession.py
@@ -82,7 +82,7 @@ class TDTestCase:
         tdSql.checkData(0, 1, 15)
 
         # session with where 
-        tdSql.query("select count(*),first(tagtype),last(tagtype),avg(tagtype),sum(tagtype),min(tagtype),max(tagtype),leastsquares(tagtype, 1, 1),spread(tagtype)  from dev_001 where ts <'2020-05-20 0:0:0' session(ts,1d)")
+        tdSql.query("select count(*),first(tagtype),last(tagtype),avg(tagtype),sum(tagtype),min(tagtype),max(tagtype),leastsquares(tagtype, 1, 1),spread(tagtype),stddev(tagtype),percentile(tagtype,0)  from dev_001 where ts <'2020-05-20 0:0:0' session(ts,1d)")
         tdSql.checkRows(2)
         tdSql.checkData(0, 1, 13)
         tdSql.checkData(0, 2, 1)
@@ -93,6 +93,9 @@ class TDTestCase:
         tdSql.checkData(0, 7, 13)
         tdSql.checkData(0, 8, '{slop:1.000000, intercept:0.000000}')
         tdSql.checkData(0, 9, 12)
+        tdSql.checkData(0, 10, 3.741657387)
+        tdSql.checkData(0, 11, 1)
+        tdSql.checkData(1, 11, 14)
 
         # tdsql err
         tdSql.error("select * from dev_001 session(ts,1w)")