diff --git a/tests/pytest/insert/nchar.py b/tests/pytest/insert/nchar.py
index b8e365f143abfca2eb39f258078fb59120c168e1..3319aa3c565b76d4d7fb9c33b04549e090c8062b 100644
--- a/tests/pytest/insert/nchar.py
+++ b/tests/pytest/insert/nchar.py
@@ -35,6 +35,8 @@ class TDTestCase:
         tdSql.checkRows(2)
         tdSql.checkData(1, 1, '涛思数据')
 
+        tdSql.error("insert into tb values (now, 'taosdata001')")
+        
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)
diff --git a/tests/pytest/tag_lite/bigint.py b/tests/pytest/tag_lite/bigint.py
index ecc6fad44d9a66acb2aaf4e47560eff5204a6cfe..f83961aaad401f337a1dc4f0d305391f22006b9a 100644
--- a/tests/pytest/tag_lite/bigint.py
+++ b/tests/pytest/tag_lite/bigint.py
@@ -575,6 +575,20 @@ class TDTestCase:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
 
+        tdSql.execute("create database db")
+        tdSql.execute("use db")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev bigint)")
+                
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (pow(2, 63) - 1))
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags(%d)' % (-1 * pow(2, 63) + 1))
+
+        print("==============step2")    
+        tdSql.query("show tables")
+        tdSql.checkRows(2)   
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)
diff --git a/tests/pytest/tag_lite/binary.py b/tests/pytest/tag_lite/binary.py
index a5757dc5cd664114da066cbfde485ca680e9a6d8..4cbae63bec1ec6a885f015a69bb4192e93cc9629 100644
--- a/tests/pytest/tag_lite/binary.py
+++ b/tests/pytest/tag_lite/binary.py
@@ -579,6 +579,20 @@ class TDTestCase:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
 
+        tdSql.execute("create database db")
+        tdSql.execute("use db")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev binary(5))")
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags("dev_001")')
+        
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags("dev")')
+
+        print("==============step2")    
+        tdSql.query("show tables")
+        tdSql.checkRows(1)        
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)
diff --git a/tests/pytest/tag_lite/float.py b/tests/pytest/tag_lite/float.py
index 7b93cb0ac91d49299aedfa63e5dcc8571415cdce..9c4d20e82bc92e193d18de74c18ba286d1af3a95 100644
--- a/tests/pytest/tag_lite/float.py
+++ b/tests/pytest/tag_lite/float.py
@@ -575,6 +575,23 @@ class TDTestCase:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
 
+        tdSql.execute("create database db")
+        tdSql.execute("use db")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev float)")
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%f)' % -3.4E38 - 1)
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%f)' % 3.4E38 + 1)
+        
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_001 using st tags(%f)' % 3.4E38)
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags(%f)' % -3.4E38)
+          
+        tdSql.query("show tables")
+        tdSql.checkRows(2)  
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)
diff --git a/tests/pytest/tag_lite/int.py b/tests/pytest/tag_lite/int.py
index 99d4a69624812e853bfaa2ffad89c9d9e88879a5..d5a69173893c4e5c8341b6235c5dd8465f913111 100644
--- a/tests/pytest/tag_lite/int.py
+++ b/tests/pytest/tag_lite/int.py
@@ -574,6 +574,24 @@ class TDTestCase:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
 
+        tdSql.execute("create database db")
+        tdSql.execute("use db")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev int)")
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % pow(2, 31))
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (-1 * pow(2, 31)))
+        
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (pow(2, 31) - 1))
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags(%d)' % (-1 * pow(2, 31) + 1))
+
+        print("==============step2")    
+        tdSql.query("show tables")
+        tdSql.checkRows(2)   
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)
diff --git a/tests/pytest/tag_lite/nchar.py b/tests/pytest/tag_lite/nchar.py
new file mode 100644
index 0000000000000000000000000000000000000000..851cc32b56c9104e2f87d5c8ea58ffa0d56ac1a6
--- /dev/null
+++ b/tests/pytest/tag_lite/nchar.py
@@ -0,0 +1,48 @@
+###################################################################
+#           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 tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+
+        print("==============step1")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev nchar(5))")
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags("dev_001")')
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags("dev")')
+
+
+        print("==============step2")    
+        tdSql.query("show tables")
+        tdSql.checkRows(1)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
diff --git a/tests/pytest/tag_lite/smallint.py b/tests/pytest/tag_lite/smallint.py
index 089af55a3496bfaf59e833c18d5f7d34175c3212..c060e3f82b6b5f2b6d32fd50e5ea8181f655ad9b 100644
--- a/tests/pytest/tag_lite/smallint.py
+++ b/tests/pytest/tag_lite/smallint.py
@@ -574,6 +574,23 @@ class TDTestCase:
         # TSIM:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
+        tdSql.execute("create database db")
+        tdSql.execute("use db")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev smallint)")
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % pow(2, 15))
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (-1 * pow(2, 15)))
+        
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (pow(2, 15) - 1))
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags(%d)' % (-1 * pow(2, 15) + 1))
+
+        print("==============step2")    
+        tdSql.query("show tables")
+        tdSql.checkRows(2)   
 
     def stop(self):
         tdSql.close()
diff --git a/tests/pytest/tag_lite/tinyint.py b/tests/pytest/tag_lite/tinyint.py
index 55e33d013beaddccf769aec4b28719d1e5cb9db8..089dd46569578c1ca33d73639cb36a0bba03e0f0 100644
--- a/tests/pytest/tag_lite/tinyint.py
+++ b/tests/pytest/tag_lite/tinyint.py
@@ -575,6 +575,24 @@ class TDTestCase:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
 
+        tdSql.execute("create database db")
+        tdSql.execute("use db")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev tinyint)")
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % pow(2, 7))
+        tdSql.error(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (-1 * pow(2, 7)))
+        
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_001 using st tags(%d)' % (pow(2, 7) - 1))
+        tdSql.execute(
+            'CREATE TABLE if not exists dev_002 using st tags(%d)' % (-1 * pow(2, 7) + 1))
+
+        print("==============step2")    
+        tdSql.query("show tables")
+        tdSql.checkRows(2)   
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)