diff --git a/tests/pytest/table/column_name.py b/tests/pytest/table/column_name.py
index bb1f587a65b42ab447817e8bb2760e582ac8c986..aa958fd60c98dc86f031f6980ca476802e5ff805 100644
--- a/tests/pytest/table/column_name.py
+++ b/tests/pytest/table/column_name.py
@@ -1,6 +1,9 @@
 # -*- coding: utf-8 -*-
 
 import sys
+import string
+import random
+import subprocess
 from util.log import *
 from util.cases import *
 from util.sql import *
@@ -14,34 +17,9 @@ class TDTestCase:
     def run(self):
         tdSql.prepare()
 
-        # TSIM: system sh/stop_dnodes.sh
-        # TSIM:
-        # TSIM: system sh/ip.sh -i 1 -s up
-        # TSIM: system sh/deploy.sh -n dnode1 -m 192.168.0.1 -i 192.168.0.1
-        # TSIM: system sh/cfg.sh -n dnode1 -c walLevel -v 0
-        # TSIM: system sh/exec.sh -n dnode1 -s start
-        # TSIM:
-        # TSIM: sleep 3000
-        # TSIM: sql connect
-        # TSIM:
-        # TSIM: $i = 0
-        # TSIM: $dbPrefix = lm_cm_db
-        # TSIM: $tbPrefix = lm_cm_tb
-        # TSIM: $db = $dbPrefix . $i
-        # TSIM: $tb = $tbPrefix . $i
-        # TSIM:
-        # TSIM: print =============== step1
         tdLog.info('=============== step1')
-        # TSIM: sql create database $db
-        # TSIM: sql use $db
-        # TSIM:
-        # TSIM: sql drop table dd -x step0
         tdLog.info('drop table dd -x step0')
         tdSql.error('drop table dd')
-        # TSIM: return -1
-        # TSIM: step0:
-        # TSIM:
-        # TSIM: sql create table $tb(ts timestamp, int) -x step1
         tdLog.info('create table tb(ts timestamp, int) -x step1')
         tdSql.error('create table tb(ts timestamp, int)')
         # TSIM: return -1
@@ -112,37 +90,24 @@ class TDTestCase:
         tdLog.info('=============== step4')
         # TSIM: sql create table $tb (ts timestamp,
         # a0123456789012345678901234567890123456789 int)
+        getMaxColNum = "grep -w '#define TSDB_COL_NAME_LEN' ../../src/inc/taosdef.h|awk '{print $3}'"
+        boundary = int(subprocess.check_output(getMaxColNum, shell=True))
+        tdLog.info("get max column name length is %d" % boundary)
+        chars = string.ascii_uppercase + string.ascii_lowercase
+
+#        col_name = ''.join(random.choices(chars, k=boundary+1))
+#        tdLog.info(
+#            'create table tb (ts timestamp, %s int), col_name length is %d' % (col_name, len(col_name)))
+#        tdSql.error(
+#            'create table tb (ts timestamp, %s int)' % col_name)
+
+        col_name = ''.join(random.choices(chars, k=boundary))
         tdLog.info(
-            'create table tb (ts timestamp, a0123456789012345678901234567890123456789 int)')
+            'create table tb (ts timestamp, %s int), col_name length is %d' %
+            (col_name, len(col_name)))
         tdSql.execute(
-            'create table tb (ts timestamp, a0123456789012345678901234567890123456789 int)')
-        # TSIM: sql drop table $tb
-        tdLog.info('drop table tb')
-        tdSql.execute('drop table tb')
-        # TSIM:
-        # TSIM: sql show tables
-        tdLog.info('show tables')
-        tdSql.query('show tables')
-        # TSIM: if $rows != 0 then
-        tdLog.info('tdSql.checkRow(0)')
-        tdSql.checkRows(0)
-        # TSIM: return -1
-        # TSIM: endi
-        # TSIM:
-        # TSIM: print =============== step5
-        tdLog.info('=============== step5')
-        # TSIM: sql create table $tb (ts timestamp, a0123456789 int)
-        tdLog.info('create table tb (ts timestamp, a0123456789 int)')
-        tdSql.execute('create table tb (ts timestamp, a0123456789 int)')
-        # TSIM: sql show tables
-        tdLog.info('show tables')
-        tdSql.query('show tables')
-        # TSIM: if $rows != 1 then
-        tdLog.info('tdSql.checkRow(1)')
-        tdSql.checkRows(1)
-        # TSIM: return -1
-        # TSIM: endi
-        # TSIM:
+            'create table tb (ts timestamp, %s int)' % col_name)
+
         # TSIM: sql insert into $tb values (now , 1)
         tdLog.info("insert into tb values (now , 1)")
         tdSql.execute("insert into tb values (now , 1)")
@@ -152,24 +117,6 @@ class TDTestCase:
         # TSIM: if $rows != 1 then
         tdLog.info('tdSql.checkRow(1)')
         tdSql.checkRows(1)
-        # TSIM: return -1
-        # TSIM: endi
-        # TSIM:
-        # TSIM: sql drop database $db
-        tdLog.info('drop database db')
-        tdSql.execute('drop database db')
-        # TSIM: sql show databases
-        tdLog.info('show databases')
-        tdSql.query('show databases')
-        # TSIM: if $rows != 0 then
-        tdLog.info('tdSql.checkRow(0)')
-        tdSql.checkRows(0)
-        # TSIM: return -1
-        # TSIM: endi
-        # TSIM:
-        # TSIM:
-        # TSIM:
-        # TSIM:
 # convert end
 
     def stop(self):