diff --git a/tests/system-test/0-others/tag_index_basic.py b/tests/system-test/0-others/tag_index_basic.py
new file mode 100644
index 0000000000..2d2f7a231b
--- /dev/null
+++ b/tests/system-test/0-others/tag_index_basic.py
@@ -0,0 +1,161 @@
+###################################################################
+#           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 -*-
+
+
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.common import *
+from util.sqlset import *
+import random
+
+
+class TDTestCase:
+    def init(self, conn, logSql, replicaVar=1):
+        self.replicaVar = int(replicaVar)
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+        self.setsql = TDSetSql()
+        self.column_dict = {
+            '`ts`': 'timestamp',
+            '`col1`': 'tinyint',
+            '`col2`': 'smallint',
+            '`col3`': 'int',
+            '`col4`': 'bigint',
+            '`col5`': 'tinyint unsigned',
+            '`col6`': 'smallint unsigned',
+            '`col7`': 'int unsigned',
+            '`col8`': 'bigint unsigned',
+            '`col9`': 'float',
+            '`col10`': 'double',
+            '`col11`': 'bool',
+            '`col12`': 'varchar(20)',
+            '`col13`': 'nchar(20)'            
+        }
+        self.tag_dict = {
+            '`t1`': 'tinyint',
+            '`t2`': 'smallint',
+            '`t3`': 'int',
+            '`t4`': 'bigint',
+            '`t5`': 'tinyint unsigned',
+            '`t6`': 'smallint unsigned',
+            '`t7`': 'int unsigned',
+            '`t8`': 'bigint unsigned',
+            '`t9`': 'float',
+            '`t10`': 'double',
+            '`t11`': 'bool',
+            '`t12`': 'varchar(20)',
+            '`t13`': 'nchar(20)',
+            '`t14`': 'timestamp'            
+        }
+
+    
+    def set_stb_sql(self,stbname,column_dict,tag_dict):
+        column_sql = ''
+        tag_sql = ''
+        for k,v in column_dict.items():
+            column_sql += f"{k} {v}, "
+        for k,v in tag_dict.items():
+            tag_sql += f"{k} {v}, "
+        create_stb_sql = f'create stable {stbname} ({column_sql[:-2]}) tags ({tag_sql[:-2]})'
+        return create_stb_sql
+    
+    # create stable and child tables
+    def create_table(self, stbname, tbname, count):
+        tdSql.prepare()
+        tdSql.execute('use db')
+        
+        # create stable
+        create_table_sql = self.set_stb_sql(stbname, self.column_dict, self.tag_dict)
+        tdSql.execute(create_table_sql)
+
+        # create child table
+        for i in range(count):
+            tags = f'{i},{i},{i},{i},{i},{i},{i},{i},{i}.000{i},{i}.000{i},true,"var{i}","nch{i}",now'
+            sql  = f'create table {tbname}{i} using {stbname} tags({tags})'
+            tdSql.execute(sql)
+    
+    
+    # create stable and child tables
+    def create_tagidx(self, stbname):
+        for key in self.tag_dict.keys:
+            sql = f'create idx_{key} on {stbname} ({key})'
+            tdSql.execute(sql)
+
+    # check show indexs
+    def show_tagidx(self, stbname):
+        sql = f'select index_name,column_name from information_schema.ins_indexes where db_name="db"'
+        tdSql.execute(sql)
+        i = 0
+        for key in self.tag_dict.keys:
+            tdSql.checkData(i, 0, f'idx_{key}')
+            tdSql.checkData(i, 1, f'{key}')
+            i += 1
+
+    # query with tag idx
+    def query_tagidx(self, stbname):
+        sql = f'select * from meters where t1=10'
+        tdSql.execute(sql)
+        sql = f'select * from meters where t2<10'
+        tdSql.execute(sql)
+        sql = f'select * from meters where t3>10'
+        tdSql.execute(sql)
+        sql = f'select * from meters where t12="11"'
+        tdSql.execute(sql)
+        sql = f'select * from meters where (t4 < 10 or t5 = 20) and t6= 30'
+        tdSql.execute(sql)
+        sql = f'select * from meters where (t7 < 20 and t8 = 20) or t9= 30'
+        tdSql.execute(sql)
+
+    # drop child table
+    def drop_tables(self, tbname, count):
+        start = random.randint(1, count/2)
+        end   = random.random(count/2 + 1, count - 1)
+        for i in range(start, end):
+            sql = f'drop table {tbname}{i}'
+            tdSql.execute(sql)
+
+    # drop tag index
+    def drop_tagidx(self, stbname):
+        # drop index
+        for key in self.tag_dict.keys:
+            sql = f'drop index idx_{key}'
+            tdSql.execute(sql)
+        
+        # check idx result is 0
+        sql = f'select index_name,column_name from information_schema.ins_indexes where db_name="db"'
+        tdSql.execute(sql)
+        tdSql.checkRows(0)
+
+    # run
+    def run(self):
+        stable = "meters"
+        tbname = "d"
+        count = 1000
+        self.create_table(stable, tbname, count)
+        self.create_tagidx(stable)
+        self.show_tagidx(stable)
+        self.query_tagidx(stable)
+        self.drop_tables(tbname, count)
+        self.drop_tagidx(stable)
+        # query after delete , expect no crash
+        self.query_tagidx(stable)
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
+