diff --git a/src/connector/python/taos/cinterface.py b/src/connector/python/taos/cinterface.py
index cc7c279458c779b924564cdb17c88989014e3193..6d8ceb7a293ef71c7e8944772e6b8a6a0ed8e7a9 100644
--- a/src/connector/python/taos/cinterface.py
+++ b/src/connector/python/taos/cinterface.py
@@ -403,6 +403,20 @@ class CTaosInterface(object):
         """
         return CTaosInterface.libtaos.taos_affected_rows(result)
 
+    @staticmethod
+    def insertLines(connection, lines):
+        '''
+            insert through lines protocol
+            @lines: list of str
+            @rtype: tsdb error codes 
+        '''
+        numLines = len(lines)
+        c_lines_type = ctypes.c_char_p*numLines
+        c_lines = c_lines_type()
+        for i in range(numLines):
+            c_lines[i] = ctypes.c_char_p(lines[i].encode('utf-8'))
+        return CTaosInterface.libtaos.taos_insert_lines(connection, c_lines, ctypes.c_int(numLines))
+
     @staticmethod
     def subscribe(connection, restart, topic, sql, interval):
         """Create a subscription
diff --git a/src/connector/python/taos/connection.py b/src/connector/python/taos/connection.py
index f6c395342c9c39a24bda6022f0ed36cb7bfe045b..88d06cd7186018788aeb25c982fc205441193cb8 100644
--- a/src/connector/python/taos/connection.py
+++ b/src/connector/python/taos/connection.py
@@ -66,6 +66,14 @@ class TDengineConnection(object):
             self._conn, restart, topic, sql, interval)
         return TDengineSubscription(sub)
 
+    def insertLines(self, lines):
+        """
+        insert lines through line protocol
+        """
+        if self._conn is None:
+            return None
+        return CTaosInterface.insertLines(self._conn, lines)
+        
     def cursor(self):
         """Return a new Cursor object using the connection.
         """
diff --git a/tests/examples/c/apitest.c b/tests/examples/c/apitest.c
index a377bbc7b47e1a58d4b3294b88386a9c4fb74e47..157eb8da13cabaf443c416daccdd5deb5296d2a0 100644
--- a/tests/examples/c/apitest.c
+++ b/tests/examples/c/apitest.c
@@ -975,9 +975,14 @@ int32_t verify_schema_less(TAOS* taos) {
       "stf,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin_stf\",c2=false,c5=5,c6=7u 1626006933641a"
   };
 
-//  int code = taos_insert_lines(taos, lines , sizeof(lines)/sizeof(char*));
-  int code = taos_insert_lines(taos, &lines[0], 1);
-  code = taos_insert_lines(taos, &lines[1], 1);
+  int code = 0;
+  code = taos_insert_lines(taos, lines , sizeof(lines)/sizeof(char*));
+  char* lines2[] = {
+      "stg,t1=3i,t2=4,t3=\"t3\" c1=3i,c3=L\"passit\",c2=false,c4=4 1626006833639000000",
+      "stg,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin\",c2=true,c4=5,c5=5 1626006833640000000"
+  };
+  code = taos_insert_lines(taos, &lines2[0], 1);
+  code = taos_insert_lines(taos, &lines2[1], 1);
 
   return code;
 }
@@ -1000,10 +1005,7 @@ int main(int argc, char *argv[]) {
   printf("client info: %s\n", info);
 
   printf("************  verify shemaless  *************\n");
-  int code = verify_schema_less(taos);
-  if (code == 0) {
-    return code;
-  }
+  verify_schema_less(taos);
 
   printf("************  verify query  *************\n");
   verify_query(taos);
diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index 1f45cab13a9187b8cf16a573bb73dfb64ce7541b..d802db1f4831ca77db609ae2cf82c980d739b050 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -27,6 +27,7 @@ python3 ./test.py -f insert/bug3654.py
 python3 ./test.py -f insert/insertDynamicColBeforeVal.py
 python3 ./test.py -f insert/in_function.py
 python3 ./test.py -f insert/modify_column.py
+python3 ./test.py -f insert/line_insert.py
 
 #table
 python3 ./test.py -f table/alter_wal0.py
diff --git a/tests/pytest/insert/line_insert.py b/tests/pytest/insert/line_insert.py
new file mode 100644
index 0000000000000000000000000000000000000000..1e13dee07c295f4ad5202f5707bc595ae0396ba3
--- /dev/null
+++ b/tests/pytest/insert/line_insert.py
@@ -0,0 +1,82 @@
+###################################################################
+#           Copyright (c) 2021 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
+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)
+        self._conn = conn 
+
+    def run(self):
+        print("running {}".format(__file__))
+        tdSql.execute("drop database if exists test")
+        tdSql.execute("create database if not exists test precision 'us'")
+        tdSql.execute('use test')
+
+        tdSql.execute('create stable ste(ts timestamp, f int) tags(t1 bigint)')
+
+        lines = [
+            "st,t1=3i,t2=4,t3=\"t3\" c1=3i,c3=L\"passit\",c2=false,c4=4 1626006833639000000",
+            "st,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin\",c2=true,c4=5,c5=5 1626006833640000000",
+            "ste,t2=5,t3=L\"ste\" c1=true,c2=4,c3=\"iam\" 1626056811823316532",
+            "st,t1=4i,t2=5,t3=\"t4\" c1=3i,c3=L\"passitagain\",c2=true,c4=5 1626006833642000000",
+            "ste,t2=5,t3=L\"ste2\" c3=\"iamszhou\",c4=false 1626056811843316532",
+            "ste,t2=5,t3=L\"ste2\" c3=\"iamszhou\",c4=false,c5=32b,c6=64s,c7=32w,c8=88.88f 1626056812843316532",
+            "st,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin\",c2=true,c4=5,c5=5,c6=7u 1626006933640000000",
+            "stf,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin\",c2=true,c4=5,c5=5,c6=7u 1626006933640000000",
+            "stf,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin_stf\",c2=false,c5=5,c6=7u 1626006933641a"]
+
+        code = self._conn.insertLines(lines)
+        print("insertLines result {}".format(code))
+
+        lines2 = [
+                "stg,t1=3i,t2=4,t3=\"t3\" c1=3i,c3=L\"passit\",c2=false,c4=4 1626006833639000000",
+                "stg,t1=4i,t3=\"t4\",t2=5,t4=5 c1=3i,c3=L\"passitagin\",c2=true,c4=5,c5=5 1626006833640000000"]
+        
+        code = self._conn.insertLines([ lines2[0] ])
+        print("insertLines result {}".format(code))
+
+        self._conn.insertLines([ lines2[1] ])
+        print("insertLines result {}".format(code))
+
+        tdSql.query("select * from st");
+        tdSql.checkRows(4)
+
+        tdSql.query("select * from ste");
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from stf");
+        tdSql.checkRows(2)
+
+        tdSql.query("select * from stg");
+        tdSql.checkRows(2)
+
+        tdSql.query("show tables");
+        tdSql.checkRows(8)
+
+        tdSql.query("describe stf");
+        tdSql.checkData(3,2, 14)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
diff --git a/tests/script/fullGeneralSuite.sim b/tests/script/fullGeneralSuite.sim
index c820dd3bf56fb5268092dbdec2d37d7cfa0ca0c5..5b5a911558b5eb1d27f34fb10590a3b9ff52658c 100644
--- a/tests/script/fullGeneralSuite.sim
+++ b/tests/script/fullGeneralSuite.sim
@@ -105,6 +105,7 @@ run general/parser/import_commit2.sim
 run general/parser/import_commit3.sim
 run general/parser/insert_tb.sim
 run general/parser/first_last.sim
+run general/parser/line_insert.sim
 #unsupport run general/parser/import_file.sim
 run general/parser/lastrow.sim
 run general/parser/nchar.sim