diff --git a/tests/parallel_test/cases.task b/tests/parallel_test/cases.task
index a5b683d4c884d80b54642332ca211fe419f2f67e..578756d03e8395ae1d51b4041d9b605df23dffb4 100644
--- a/tests/parallel_test/cases.task
+++ b/tests/parallel_test/cases.task
@@ -807,6 +807,11 @@
 4,,pytest,python3 test.py -f insert/line_insert.py
 3,,pytest,python3 test.py -f tag_lite/binary.py 
 3,,pytest,python3 test.py -f query/filterAllIntTypes.py 
+3,,pytest,python3 test.py -f dbmgmt/dbNameCaseSensitive.py 
+3,,pytest,python3 test.py -f insert/schemalessCaseSensitive.py  
+3,,pytest,python3 test.py -f table/columnNameCaseSensitive.py 
+3,,pytest,python3 test.py -f table/tagNameCaseSensitive.py  
+3,,pytest,python3 test.py -f table/tbNameCaseSensitive.py 
 3,,develop-test,python3 ./test.py -f 2-query/ts_hidden_column.py 
 3,,develop-test,python3 ./test.py -f 2-query/ts_shortcut.py
 3,,develop-test,python3 ./test.py -f 2-query/nchar_funcs.py
diff --git a/tests/pytest/dbmgmt/dbNameCaseSensitive.py b/tests/pytest/dbmgmt/dbNameCaseSensitive.py
new file mode 100644
index 0000000000000000000000000000000000000000..92a815b14425ff800476edc5155483f5d1ea6ece
--- /dev/null
+++ b/tests/pytest/dbmgmt/dbNameCaseSensitive.py
@@ -0,0 +1,76 @@
+###################################################################
+#           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 *
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+        self._conn = conn
+
+    def run(self):        
+
+        # database name
+        tdSql.execute("create database db")
+        tdSql.query("show databases")
+        tdSql.checkRows(1)
+
+        tdSql.error("create database Db")
+        tdSql.error("create database `db`")
+        tdSql.execute("create database `Db`")
+        tdSql.query("show databases")
+        tdSql.checkRows(2)
+
+        tdSql.execute("alter database db cachelast 1")
+        tdSql.execute("alter database `Db` cachelast 1")
+
+        tdSql.execute("use db")
+        tdSql.query("select database()")
+        tdSql.checkData(0, 0, 'db');
+        tdSql.query("show db.vgroups")
+        tdSql.checkRows(0)
+
+        tdSql.execute("use `Db`")
+        tdSql.query("select database()")
+        tdSql.checkData(0, 0, 'Db');
+        tdSql.query("show `Db`.vgroups")
+        tdSql.checkRows(0)
+        tdSql.query("show create database `Db`")
+        tdSql.checkRows(1)
+
+
+        tdSql.execute("drop database db")
+        tdSql.execute("drop database `Db`")
+
+        tdSql.query("show databases")
+        tdSql.checkRows(0)
+
+        # corner cases
+        tdSql.execute("create database `电力系统`")
+        tdSql.query("show `电力系统`.vgroups")
+        tdSql.checkRows(0)
+        tdSql.query("show databases")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, "电力系统")
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/pytest/insert/schemalessCaseSensitive.py b/tests/pytest/insert/schemalessCaseSensitive.py
new file mode 100644
index 0000000000000000000000000000000000000000..c7db1bed1adc14374b06e74254971525dd190c67
--- /dev/null
+++ b/tests/pytest/insert/schemalessCaseSensitive.py
@@ -0,0 +1,69 @@
+###################################################################
+#           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.types import TDSmlProtocolType, TDSmlTimestampType
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+        self._conn = conn
+
+    def run(self):
+
+        # schemaless
+        tdSql.execute("create database line_insert precision 'ns' ")
+        tdSql.execute("use line_insert")
+        lines = [   
+                    "St,deviceId=1i voltage=1,phase=\"Test\" 1626006833639000000",
+                    "St,DeviceId=3i voltage=2,phase=\"Test\" 1626006833639000000",
+                    "St,deviceId=2i,DeviceId=3 Voltage=2,Phase=\"Test2\" 1626006833639000000",                    
+                    "St,deviceId=4i,DeviceId=3 voltage=1,phase=\"Test\",Voltage=2,Phase=\"Test1\" 1626006833639000000",
+                    "tbl,deviceId=\"sensor0\" Hello=3i 1646053743694400029",
+                    "tbl,deviceId=\"sensor0\" n=3i,N=4i 1646053743694400030",
+                    "tbl,deviceId=\"sensor0\" g=3i 1646053743694400031",
+                    "tbl,deviceId=\"sensor0\" G=3i 1646053743694400032",
+                    "tbl,deviceId=\"sensor0\" nice=2i,Nice=3i 1646053743694400033",
+                    "tbl,deviceId=\"sensor0\" hello=3i 1646053743694400034",
+                    "超级表,deviceId=\"sensor0\" 电压=3i 1646053743694400035",
+                ]
+
+        code = self._conn.schemaless_insert(lines, TDSmlProtocolType.LINE.value, TDSmlTimestampType.NANO_SECOND.value)
+        tdSql.query("show stables")
+        tdSql.checkRows(3)
+
+        tdSql.query("show tables")
+        tdSql.checkRows(6)
+
+        tdSql.query("describe `St`")
+        tdSql.checkRows(7)
+
+        tdSql.query("select * from `St`")
+        tdSql.checkRows(4)
+
+        tdSql.query("select * from tbl")
+        tdSql.checkRows(6)
+
+        tdSql.query("select * from `超级表`")
+        tdSql.checkRows(1)
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/pytest/table/columnNameCaseSensitive.py b/tests/pytest/table/columnNameCaseSensitive.py
new file mode 100644
index 0000000000000000000000000000000000000000..036786ae70e0d4d440f5d77371c731bd9202e6d1
--- /dev/null
+++ b/tests/pytest/table/columnNameCaseSensitive.py
@@ -0,0 +1,162 @@
+###################################################################
+#           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 *
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())    
+
+    def run(self):
+        tdSql.prepare()
+
+        # column
+        tdSql.execute("create table tb(ts timestamp, c1 int)")
+        tdSql.execute("create table `TB`(ts timestamp, c1 int)")
+        tdSql.error("alter table tb add column C1 int")
+        tdSql.execute("alter table tb add column `C1` int")
+        tdSql.error("alter table `TB` add column C1 int")
+        tdSql.execute("alter table `TB` add column `C1` int")
+
+        tdSql.error("create table tb2(ts timestamp, c1 int, C1 int)")
+        tdSql.execute("create table tb2(ts timestamp, c1 int, `C1` int)")
+        tdSql.query("describe tb2")
+        tdSql.checkRows(3)
+        tdSql.checkData(0, 0, 'ts')
+        tdSql.checkData(1, 0, 'c1')
+        tdSql.checkData(2, 0, 'C1')        
+
+        tdSql.execute("insert into tb2(ts, c1) values(now, 1)")
+        tdSql.execute("insert into tb2(ts, `C1`) values(now, 1)")
+        tdSql.execute("insert into tb2(ts, c1, `C1`) values(now, 1, 2)")
+        tdSql.query("select * from tb2")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from tb2 where c1 = 1")
+        tdSql.checkRows(2)
+
+        tdSql.query("select * from tb2 where `C1` = 1")        
+        tdSql.checkRows(1)
+
+        tdSql.query("select c1 `C1` from tb2 where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select c1 as `C1` from tb2 where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `C1` a from tb2 where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `C1` as a from tb2 where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.execute("alter table tb2 drop column c1")
+        tdSql.query("describe tb2")
+        tdSql.checkRows(2)
+
+        tdSql.error("create table `TB2`(ts timestamp, c1 int, C1 int)")
+        tdSql.execute("create table `TB2`(ts timestamp, c1 int, `C1` int)")
+        tdSql.query("describe `TB2`")
+        tdSql.checkRows(3)
+        tdSql.checkData(0, 0, 'ts')
+        tdSql.checkData(1, 0, 'c1')
+        tdSql.checkData(2, 0, 'C1')
+
+        tdSql.execute("insert into `TB2`(ts, c1) values(now, 1)")
+        tdSql.execute("insert into `TB2`(ts, `C1`) values(now, 1)")
+        tdSql.execute("insert into `TB2`(ts, c1, `C1`) values(now, 1, 2)")
+        tdSql.query("select * from `TB2`")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from `TB2` where c1 = 1")        
+        tdSql.checkRows(2)
+
+        tdSql.query("select * from `TB2` where `C1` = 1")        
+        tdSql.checkRows(1)
+
+        tdSql.query("select c1 `C1` from `TB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select c1 as `C1` from `TB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `C1` a from `TB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `C1` as a from `TB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.execute("alter table `TB2` drop column `C1`")
+        tdSql.query("describe tb2")
+        tdSql.checkRows(2)
+
+        tdSql.error("create table `STB2`(ts timestamp, c1 int, C1 int) tags (t1 int)")
+        tdSql.execute("create table `STB2`(ts timestamp, c1 int, `C1` int) tags (t1 int)")
+        tdSql.query("describe `STB2`")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 'ts')
+        tdSql.checkData(1, 0, 'c1')
+        tdSql.checkData(2, 0, 'C1')
+        tdSql.checkData(3, 0, 't1')
+
+        tdSql.execute("insert into tt2(ts, c1) using `STB2` tags(1) values(now, 1)")
+        tdSql.execute("insert into tt2(ts, `C1`) using `STB2` tags(1) values(now, 1)")
+        tdSql.execute("insert into tt2(ts, c1, `C1`) using `STB2` tags(1) values(now, 1, 2)")
+        tdSql.query("select * from `STB2`")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from `STB2` where c1 = 1")
+        tdSql.checkRows(2)
+
+        tdSql.query("select * from `STB2` where `C1` = 1")        
+        tdSql.checkRows(1)
+
+        tdSql.query("select c1 `C1` from `STB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select c1 as `C1` from `STB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `C1` a from `STB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `C1` as a from `STB2` where `C1` = 1")
+        tdSql.checkRows(1)
+
+        tdSql.execute("alter table `STB2` drop column `C1`")
+        tdSql.query("describe tb2")
+        tdSql.checkRows(2)
+
+        # cornor cases
+        tdSql.execute("alter table `STB2` add column `数量` int")
+        tdSql.execute("insert into tt3(ts, `数量`) using `STB2` tags(2) values(now, 1)")
+        tdSql.query("select * from tt3")
+        tdSql.checkRows(1)
+        tdSql.query("select ts `TS` from tt3")
+        tdSql.checkRows(1)
+        tdSql.query("select ts as `TS` from tt3")
+        tdSql.checkRows(1)
+        tdSql.query("select ts as `时间戳` from tt3")
+        tdSql.checkRows(1)
+        tdSql.query("select ts `时间戳` from tt3")        
+        tdSql.checkRows(1)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/pytest/table/tagNameCaseSensitive.py b/tests/pytest/table/tagNameCaseSensitive.py
new file mode 100644
index 0000000000000000000000000000000000000000..d448d702caba4ca5ae53d0406ce0b9afcf149ad7
--- /dev/null
+++ b/tests/pytest/table/tagNameCaseSensitive.py
@@ -0,0 +1,60 @@
+###################################################################
+#           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 *
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+        self._conn = conn
+
+    def run(self):
+        tdSql.prepare()
+
+        # tag
+        tdSql.error("create table `STB3`(ts timesatmp, c1 int) tags(t1 int, T1 int)")
+        tdSql.execute("create table `STB3`(ts timestamp, c1 int) tags(t1 int)")
+        tdSql.execute("alter table `STB3` add tag `T1` int")
+        tdSql.execute("create table `STB4`(ts timestamp, c1 int) tags(t1 int, `T1` int)")
+        tdSql.execute("create table tt3 using `STB3`(t1) tags(1)")
+        tdSql.execute("create table tt4 using `STB3`(`T1`) tags(1)")
+        tdSql.query("select t1, `T1` from `STB3`")
+        tdSql.checkRows(2)
+
+        tdSql.execute("alter table `STB3` drop tag `T1`")
+        tdSql.query("describe `STB3`")
+        tdSql.checkRows(3)
+
+        # cornor case
+        tdSql.execute("create table `STB5`(ts timestamp, c1 int) tags(t1 int, `标签` int)")
+        tdSql.execute("insert into `测试` using `STB5` tags(1, 1) values(now, 1)")
+        tdSql.query("select * from `测试`")
+        tdSql.checkRows(1)
+
+        tdSql.query("select `标签` t from `测试`")
+        tdSql.checkRows(1)
+
+        tdSql.execute("alter table `STB5` add tag `标签2` double")
+        tdSql.query("describe `STB5`")
+        tdSql.checkRows(5)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/pytest/table/tbNameCaseSensitive.py b/tests/pytest/table/tbNameCaseSensitive.py
new file mode 100644
index 0000000000000000000000000000000000000000..70d7ee3095b0dcc70215aa20fdafb78608dc3b9f
--- /dev/null
+++ b/tests/pytest/table/tbNameCaseSensitive.py
@@ -0,0 +1,121 @@
+###################################################################
+#           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 *
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+
+    def run(self):
+
+        # table/stable
+        tdSql.execute("create database test")
+        tdSql.execute("create database `Test`")
+        tdSql.execute("use test")
+        tdSql.execute("create table tb(ts timestamp, c1 int)")
+
+        tdSql.query("show tables")
+        tdSql.checkRows(1)
+        tdSql.query("show create table tb")
+        tdSql.checkRows(1)
+
+        tdSql.error("create table Tb(ts timestamp, c1 int)") 
+        tdSql.execute("create table `TB`(ts timestamp, c1 int)")
+
+        tdSql.query("show tables")
+        tdSql.checkRows(2)
+        tdSql.query("show create table `TB`")
+        tdSql.checkRows(1)
+
+        tdSql.query("describe tb")
+        tdSql.checkRows(2)
+
+        tdSql.query("describe `TB`")
+        tdSql.checkRows(2)
+
+        tdSql.execute("insert into tb values(now, 1)")
+        tdSql.error("select * from `Test`.tb")
+        tdSql.query("select * from test.tb")
+        tdSql.checkRows(1)
+
+        tdSql.execute("insert into `TB` values(now, 1)")
+        tdSql.error("select * from `Test`.`TB`")
+        tdSql.query("select * from test.`TB`")
+        tdSql.checkRows(1)         
+
+        tdSql.execute("create stable stb(ts timestamp, c1 int) tags(t1 int)")
+        tdSql.query("show stables")
+        tdSql.checkRows(1)
+
+        tdSql.error("create stable STb(ts timestamp, c1 int) tags(t1 int)")
+        tdSql.error("create stable `stb`(ts timestamp, c1 int) tags(t1 int)")
+        tdSql.execute("create stable `STB`(ts timestamp, c1 int) tags(t1 int)")
+        tdSql.query("show stables")
+        tdSql.checkRows(2)
+
+        tdSql.query("describe stb")
+        tdSql.checkRows(3)
+
+        tdSql.query("describe `STB`")
+        tdSql.checkRows(3)
+
+        tdSql.execute("insert into t1 using stb tags(1) values(now, 1)")
+        tdSql.query("select * from stb")
+        tdSql.checkRows(1)
+
+        tdSql.execute("insert into t2 using `STB` tags(1) values(now, 1)")
+        tdSql.query("select * from `STB`")
+        tdSql.checkRows(1)
+
+        tdSql.execute("insert into `T2` using `STB` tags(1) values(now, 1)")
+        tdSql.query("select * from `STB`")
+        tdSql.checkRows(2)
+
+        tdSql.query("select tbname from `STB`")
+        tdSql.checkRows(2)
+
+        tdSql.execute("alter table stb add column c2 int")
+        tdSql.execute("alter table stb add tag t2 int")
+        tdSql.execute("alter table `STB` add column c2 int")
+        tdSql.execute("alter table `STB` add tag t2 int")
+        tdSql.execute("alter table `TB` add column c2 int")
+
+        # corner cases
+        tdSql.execute("create table `超级表`(ts timestamp, c1 int) tags(t1 int)")
+        tdSql.execute("create table `子表一` using `超级表` tags(1)")
+        tdSql.execute("insert into `子表二` using `超级表` tags(1) values(now, 1)")
+
+        tdSql.query("select * from `超级表`")
+        tdSql.checkRows(1)
+        tdSql.query("select * from `子表二`")
+        tdSql.checkRows(1)
+        tdSql.query("show tables")
+        tdSql.checkRows(7)
+
+        tdSql.execute("create table `普通表` (ts timestamp, c1 int)")
+        tdSql.execute("insert into `普通表` values(now, 2)")
+        tdSql.query("select * from `普通表`")
+        tdSql.checkRows(1)
+        tdSql.query("show tables")
+        tdSql.checkRows(8)        
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file