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()
diff --git a/accton/acl_flow.py b/accton/acl_flow.py
new file mode 100755
index 0000000..c6fe8a1
--- /dev/null
+++ b/accton/acl_flow.py
@@ -0,0 +1,55 @@
+import logging
+
+from oftest import config
+import oftest.base_tests as base_tests
+import ofp
+from oftest.testutils import *
+from accton_util import *
+
+
+class NoVlanOnlyAclOutputPort(base_tests.SimpleDataPlane):
+    """
+    In OFDPA, ACL can save the packet it was dropped vlan table
+    """
+    def runTest(self):
+        ports = sorted(config["port_map"].keys())
+        delete_all_flows(self.controller)
+        delete_all_groups(self.controller)    
+        input_port=ports[0]
+        output_port=ports[1]
+        vlan_id = 10
+        dmac = [0x00, 0x12, 0x34, 0x56, 0x78, 0x9a]
+        gid, req_msg = add_one_l2_interface_grouop(self.controller, port=output_port, vlan_id=vlan_id, is_tagged=True, send_barrier=False)
+        #add ACL flow to output port
+        match = ofp.match()
+        match.oxm_list.append(ofp.oxm.in_port(input_port))
+        match.oxm_list.append(ofp.oxm.eth_dst(dmac))
+        match.oxm_list.append(ofp.oxm.vlan_vid(0x1000+vlan_id))
+        request = ofp.message.flow_add(
+            table_id=60,
+            cookie=42,
+            match=match,
+            instructions=[
+                ofp.instruction.write_actions(
+                    actions=[
+                        ofp.action.group(gid)]
+                    )
+            ],
+            priority=1)
+        #install flow
+        self.controller.message_send(request)        
+
+        dmac_str = convertMACtoStr(dmac)
+        #send packet
+        parsed_pkt = simple_tcp_packet(eth_dst=dmac_str, vlan_vid=vlan_id, dl_vlan_enable=True)
+        self.dataplane.send(input_port, str(parsed_pkt))
+        #verify packet
+        verify_packet(self, str(parsed_pkt), output_port)        
+
+        
+        
+        
+        
+        
+        
+        
\ No newline at end of file
diff --git a/accton/epr.py b/accton/epr.py
new file mode 100755
index 0000000..0a287a2
--- /dev/null
+++ b/accton/epr.py
@@ -0,0 +1,89 @@
+import logging
+
+from oftest import config
+import oftest.base_tests as base_tests
+import ofp
+from oftest.testutils import *
+from accton_util import *
+
+"""
+This file test case is copied from NTC EPR bug
+"""
+
+class pvidClear(base_tests.SimpleDataPlane):
+    """
+    AOS5700-54X-00620
+    """
+    def runTest(self):
+        ports = sorted(config["port_map"].keys())
+        delete_all_flows(self.controller)
+        delete_all_groups(self.controller)    
+        port1=ports[0]
+        port2=ports[1]
+        
+        vlan_id = 10
+
+        gid_p1, req_msg_p1 = add_one_l2_interface_grouop(self.controller, port=port1, vlan_id=vlan_id, is_tagged=False, send_barrier=False)
+        gid_p2, req_msg_p2 = add_one_l2_interface_grouop(self.controller, port=port2, vlan_id=vlan_id, is_tagged=False, send_barrier=False)        
+        #add ACL flow, in port1 out port2
+        match = ofp.match()
+        match.oxm_list.append(ofp.oxm.in_port(port1))
+        request = ofp.message.flow_add(
+            table_id=60,
+            cookie=42,
+            match=match,
+            instructions=[
+                ofp.instruction.write_actions(
+                    actions=[
+                        ofp.action.group(gid_p2)]
+                    )
+            ],
+            priority=1)
+        #install flow
+        self.controller.message_send(request)        
+        #add ACL flow, in port2 out port1
+        match = ofp.match()
+        match.oxm_list.append(ofp.oxm.in_port(port2))
+        request = ofp.message.flow_add(
+            table_id=60,
+            cookie=42,
+            match=match,
+            instructions=[
+                ofp.instruction.write_actions(
+                    actions=[
+                        ofp.action.group(gid_p1)]
+                    )
+            ],
+            priority=1)
+        #install flow
+        self.controller.message_send(request)    
+        
+        #send packet and verify packet
+        parsed_pkt = simple_tcp_packet()
+        self.dataplane.send(port1, str(parsed_pkt))
+        verify_no_packet(self, str(parsed_pkt), port2)         
+        self.dataplane.send(port2, str(parsed_pkt))        
+        verify_no_packet(self, str(parsed_pkt), port1)        
+
+        
+        #add vlan flow table
+        add_vlan_table_flow(self.controller, [port1, port2], vlan_id=vlan_id, flag=VLAN_TABLE_FLAG_ONLY_UNTAG)
+        #send packet and verify packet
+        parsed_pkt = simple_tcp_packet()
+        self.dataplane.send(port1, str(parsed_pkt))
+        verify_packet(self, str(parsed_pkt), port2)        
+        self.dataplane.send(port2, str(parsed_pkt))        
+        verify_packet(self, str(parsed_pkt), port1)
+         
+        #remove vlan table flow        
+        del_vlan_table_flow(self.controller, [port1, port2], vlan_id=vlan_id, flag=VLAN_TABLE_FLAG_ONLY_UNTAG)
+        #send packet and verify packet
+        parsed_pkt = simple_tcp_packet()
+        self.dataplane.send(port1, str(parsed_pkt))
+        verify_packet(self, str(parsed_pkt), port2)
+        self.dataplane.send(port2, str(parsed_pkt))
+        verify_no_packet(self, str(parsed_pkt), port1)
+        
+        
+        
+            
\ No newline at end of file