diff --git a/tests/test_port_config.py b/tests/test_port_config.py
new file mode 100644
index 00000000000..656b96565e1
--- /dev/null
+++ b/tests/test_port_config.py
@@ -0,0 +1,107 @@
+from swsscommon import swsscommon
+import redis
+import time
+import os
+import pytest
+
+@pytest.yield_fixture
+def port_config(request, dvs):
+    file_name = "/usr/share/sonic/hwsku/port_config.ini"
+    dvs.runcmd("cp %s %s.bak" % (file_name, file_name))
+    yield file_name
+    dvs.runcmd("mv %s.bak %s" % (file_name, file_name))
+
+class TestPortConfig(object):
+
+    def getPortName(self, dvs, port_vid):
+        cnt_db = swsscommon.DBConnector(swsscommon.COUNTERS_DB, dvs.redis_sock, 0)
+        port_map = swsscommon.Table(cnt_db, 'COUNTERS_PORT_NAME_MAP')
+
+        for k in port_map.get('')[1]:
+            if k[1] == port_vid:
+                return k[0]
+
+        return ''
+
+
+    def getPortOid(self, dvs, port_name):
+        cnt_r = redis.Redis(unix_socket_path=dvs.redis_sock, db=swsscommon.COUNTERS_DB)
+        return cnt_r.hget("COUNTERS_PORT_NAME_MAP", port_name);
+
+
+    def getVIDfromRID(self, dvs, port_rid):
+        asic_r = redis.Redis(unix_socket_path=dvs.redis_sock, db=swsscommon.ASIC_DB)
+        return asic_r.hget("RIDTOVID", port_rid);
+
+
+    def test_port_hw_lane(self, dvs):
+
+        app_db = swsscommon.DBConnector(swsscommon.APPL_DB, dvs.redis_sock, 0)
+        port_tbl = swsscommon.Table(app_db, "PORT_TABLE")
+
+        asic_r = redis.Redis(unix_socket_path=dvs.redis_sock, db=swsscommon.ASIC_DB)
+        num_lanes = asic_r.hlen("LANES")
+        for i in range(1, num_lanes+1):
+            port_rid = asic_r.hget("LANES", i)
+            port_vid = self.getVIDfromRID(dvs, port_rid)
+            port_name = self.getPortName(dvs, port_vid)
+
+            (status, fvs) = port_tbl.get(port_name)
+            assert status == True
+            for fv in fvs:
+                if fv[0] == "lanes":
+                    assert str(i) in list(fv[1].split(","))
+
+
+    def test_port_breakout(self, dvs, port_config):
+
+        # check port_config.ini
+        (exitcode, output) = dvs.runcmd(['sh', '-c', "cat %s | tail -n 1" % (port_config)])
+        try:
+            name_str, lanes_str, alias_str, index_str, speed_str = list(output.split())
+        except:
+            print "parse port_config.ini fail"
+
+        LANES_L = list(lanes_str.split(","))
+        assert len(LANES_L) == 4
+        assert int(speed_str) == 40000
+
+        # modify port_config.ini
+        eth = int(name_str.replace("Ethernet", ""))
+        index = int(index_str)
+        speed_str = "tenGigE0"
+        speed = 10000
+        dvs.runcmd("sed -i '$d' %s" % (port_config)) == 0
+        for i in range(0,4):
+            dvs.runcmd("sed -i '$a Ethernet%-7d %-17d %s/%-8d %-11d %d' %s" %
+                       (eth+i, int(LANES_L[i]), speed_str, eth+i, index+i, speed, port_config)) == 0
+
+        # delete port config
+        conf_db = swsscommon.DBConnector(swsscommon.CONFIG_DB, dvs.redis_sock, 0)
+        portTbl = swsscommon.Table(conf_db, swsscommon.CFG_PORT_TABLE_NAME)
+        keys = portTbl.getKeys()
+        assert  len(keys) > 0
+        for key in keys:
+            portTbl._del(key)
+
+        # restart to apply new port_config.ini
+        dvs.stop_swss()
+        dvs.start_swss()
+        time.sleep(5)
+
+        asic_db = swsscommon.DBConnector(swsscommon.ASIC_DB, dvs.redis_sock, 0)
+
+        for i in range(0,4):
+            port_name = 'Ethernet{0}'.format(eth+i)
+            port_oid = self.getPortOid(dvs, port_name)
+            port_tbl = swsscommon.Table(asic_db, 'ASIC_STATE:SAI_OBJECT_TYPE_PORT:{0}'.format(port_oid))
+            hw_lane_value = None
+
+            for k in port_tbl.get('')[1]:
+                if k[0] == "SAI_PORT_ATTR_HW_LANE_LIST":
+                    hw_lane_value = k[1]
+
+            assert hw_lane_value, "Can't get hw_lane list"
+            assert hw_lane_value == "1:%s" % (LANES_L[i])
+
+