diff --git a/accton/accton_util.py b/accton/accton_util.py
index e6b2adc..9ac96c8 100755
--- a/accton/accton_util.py
+++ b/accton/accton_util.py
@@ -435,7 +435,42 @@
         do_barrier(ctrl)
 
     return msgs
+    
+def del_vlan_table_flow(ctrl, ports, vlan_id=1, flag=VLAN_TABLE_FLAG_ONLY_BOTH, send_barrier=False):
+    # table 10: vlan
+    # goto to table 20
+    msgs=[]
+    for of_port in ports:
+        if (flag == VLAN_TABLE_FLAG_ONLY_TAG) or (flag == VLAN_TABLE_FLAG_ONLY_BOTH):
+            match = ofp.match()
+            match.oxm_list.append(ofp.oxm.in_port(of_port))
+            match.oxm_list.append(ofp.oxm.vlan_vid(0x1000+vlan_id))
+            request = ofp.message.flow_delete(
+                table_id=10,
+                cookie=42,
+                match=match,
+                priority=0)
+            logging.info("Del vlan %d tagged packets on port %d and go to table 20" %( vlan_id, of_port))
+            ctrl.message_send(request)
 
+        if (flag == VLAN_TABLE_FLAG_ONLY_UNTAG) or (flag == VLAN_TABLE_FLAG_ONLY_BOTH):
+            match = ofp.match()
+            match.oxm_list.append(ofp.oxm.in_port(of_port))
+            match.oxm_list.append(ofp.oxm.vlan_vid_masked(0, 0xfff))
+            request = ofp.message.flow_delete(
+                table_id=10,
+                cookie=42,
+                match=match,
+                priority=0)
+            logging.info("Del vlan %d untagged packets on port %d and go to table 20" % (vlan_id, of_port))
+            ctrl.message_send(request)
+            msgs.append(request)
+
+    if send_barrier:
+        do_barrier(ctrl)
+
+    return msgs
+    
 def add_vlan_table_flow_pvid(ctrl, in_port, match_vid=None, pvid=1, send_barrier=False):
     """it will tag pack as untagged packet wether it has tagg or not"""
     match = ofp.match()