diff --git a/src/main/webapp/WEB-INF/views/cfg/ddosIpCfgForm.jsp b/src/main/webapp/WEB-INF/views/cfg/ddosIpCfgForm.jsp
index af45a3927..1b102cf48 100644
--- a/src/main/webapp/WEB-INF/views/cfg/ddosIpCfgForm.jsp
+++ b/src/main/webapp/WEB-INF/views/cfg/ddosIpCfgForm.jsp
@@ -14,6 +14,14 @@ $(function(){
 		$("#bpsThreadshold").attr("disabled","true");
 		$("#ppsThreadshold").attr("disabled","true");
 	}
+	if($("[name='protocol']").val()==0){
+		var _ddosProtocol=$("#antiddosProtocol").val();
+		if(_ddosProtocol=="TCP_SYN"){
+			$("[name='protocol']").val(6);
+		}else if(_ddosProtocol=="UDP_NTP"||_ddosProtocol=="UDP_DNS"){
+			$("[name='protocol']").val(17);
+		}
+	}
 	$("#antiddosProtocol").on("change",function(){
 		var ddosProtocol=$("#antiddosProtocol").val();
 		if(ddosProtocol==null||ddosProtocol==""){
@@ -27,6 +35,11 @@ $(function(){
 			$("#bpsThreadshold").removeAttr("disabled");
 			$("#ppsThreadshold").removeAttr("disabled");
 		}
+		if(ddosProtocol=="TCP_SYN"){
+			$("[name='protocol']").val(6);
+		}else if(ddosProtocol=="UDP_NTP"||ddosProtocol=="UDP_DNS"){
+			$("[name='protocol']").val(17);
+		}
 	})
 	
 	$(".action").on("change", function() {