diff --git a/tests/pytest/tag_lite/timestamp.py b/tests/pytest/tag_lite/timestamp.py
new file mode 100644
index 0000000000000000000000000000000000000000..fa71c2e15422e80076f2b6a6eb26e8198a69a569
--- /dev/null
+++ b/tests/pytest/tag_lite/timestamp.py
@@ -0,0 +1,102 @@
+# -*- coding: utf-8 -*-
+
+import sys
+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(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+
+        tdLog.info('======================== dnode1 start')
+        tbPrefix = "ta_fl_tb"
+        mtPrefix = "ta_fl_mt"
+        tbNum = 10
+        rowNum = 20
+        totalNum = 200
+        tdLog.info('=============== step1')
+        i = 0
+        mt = "%s%d" % (mtPrefix, i)
+        tdSql.execute(
+            'create table %s (ts timestamp, tbcol int) TAGS(tgcol float, tgTs timestamp, tgcol2 int)' %(mt))
+        i = 0
+        ts = 1605045600000
+        tsStr = "2020-11-11 06:00:00"
+        while (i < 5):
+            tb = "%s%d" % (tbPrefix, i)
+            tdLog.info('create table %s using %s tags(%d, %d, %d)' % (tb, mt, i, ts + i, i))
+            tdSql.execute('create table %s using %s tags(%d, %d, %d)' % (tb, mt, i, ts + i, i))
+            x = 0
+            while (x < rowNum):
+                ms = x * 60000
+                #tdLog.info(
+                #    "insert into %s values (%d, %d)" %
+                #    (tb, 1605045600000 + ms, x))
+                tdSql.execute(
+                    "insert into %s values (%d, %d)" %
+                    (tb, 1605045600000 + ms, x))
+                x = x + 1
+            i = i + 1
+        tdLog.info('=============== step2')
+        tdSql.query('select * from %s' % (mt))
+        tdSql.checkRows(5 * rowNum)
+        
+        tdSql.query('select * from %s where tgTs = %ld and tgcol2 = 0' % (mt, ts))
+        tdSql.checkRows(rowNum)
+
+        tdSql.query('select * from %s where tgTs = \"%s\" and tgcol2 = 0' % (mt, tsStr))
+        tdSql.checkRows(rowNum)
+
+        tdLog.info('=============== step3')
+        i = 0 
+        while (i < 5):
+            tb = "%s%d" % (tbPrefix, i + 100)
+            tdLog.info('create table %s using %s tags(%d, \"%s\", %d)' % (tb, mt, i + 100, tsStr, i + 100))
+            tdSql.execute('create table %s using %s tags(%d, \"%s\", %d)' % (tb, mt, i + 100, tsStr, i + 100))
+            x = 0
+            while (x < rowNum):
+                ms = x * 60000
+                #tdLog.info(
+                #    "insert into %s values (%d, %d)" %
+                #    (tb, 1605045600000 + ms, x))
+                tdSql.execute(
+                    "insert into %s values (%d, %d)" %
+                    (tb, 1605045600000 + ms, x))
+                x = x + 1
+            i = i + 1
+
+        tdSql.query('select * from %s where tgTs = %ld and tgcol2 = 100' % (mt, ts))
+        tdSql.checkRows(rowNum)
+
+        tdSql.query('select * from %s where tgTs = \"%s\" and tgcol2 = 100' % (mt, tsStr))
+        tdSql.checkRows(rowNum)
+
+        tdLog.info('=============== step4')
+
+        i = 0
+        tb = "%s%d"%(tbPrefix, i + 1000) 
+        tdSql.execute('insert into  %s using %s tags(%d, \"%s\", %d) values(now, 10)' % (tb, mt, i + 100, tsStr, i + 1000))
+        tdSql.execute('insert into  %s using %s tags(%d, \"%s\", %d) values(now+2s, 10)' % (tb, mt, i + 100, tsStr, i + 1000))
+        tdSql.execute('insert into  %s using %s tags(%d, \"%s\", %d) values(now+3s, 10)' % (tb, mt, i + 100, tsStr, i + 1000))
+        tdSql.query('select * from %s where tgTs = \"%s\" and tgcol2 = 1000' % (mt, tsStr))
+        tdSql.checkRows(3)
+
+        i = 0
+        tb = "%s%d"%(tbPrefix, i + 10000) 
+        tdSql.execute('create table %s using %s tags(%d, now, %d)' % (tb, mt, i + 10000,i + 10000))
+        tdSql.checkRows(3)
+         
+         
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())