diff --git a/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/sys_arch.h b/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/sys_arch.h
index acbf8b9e..d9bf38b4 100644
--- a/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/sys_arch.h
+++ b/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/sys_arch.h
@@ -56,7 +56,7 @@
 #include <xs_base.h>
 
 /* USER CODE BEGIN 0 */
-#define SET_AS_SERVER 1 /* define this terminal is udp server or not*/
+// #define SET_AS_SERVER 1 /* define this terminal is udp server or not*/
 
 #define LOCAL_PORT_SERVER                 5001
 #define TARGET_PORT_CLIENT                LOCAL_PORT_SERVER
diff --git a/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/udp_echo.c b/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/udp_echo.c
index 9eefd849..0db73277 100644
--- a/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/udp_echo.c
+++ b/Ubiquitous/XiUOS/resources/ethernet/LwIP/arch/udp_echo.c
@@ -107,6 +107,7 @@ static void UdpEchoThreadServer(void *arg)
 
     while(1)
     {
+      memset(recv_data, 0, RECV_DATA);
       recv_data_len=recvfrom(sock,recv_data,
                              RECV_DATA,0,
                              (struct sockaddr*)&seraddr,
@@ -131,7 +132,7 @@ __exit:
 static void UdpEchoThreadClient(void *arg)
 {
   KPrintf("UdpEchoThreadClient start.\n");
-  MdelayKTask(5000);
+
   int sock_udp_send_once = -1;
   sock_udp_send_once = socket(AF_INET, SOCK_DGRAM, 0);
   if (sock_udp_send_once < 0)
@@ -155,17 +156,20 @@ static void UdpEchoThreadClient(void *arg)
   KPrintf("UDP connect sucess, start to send.\n");
   KPrintf("\n\nTarget Port:%d\n\n", udp_sock.sin_port);
 
-  sendto(sock_udp_send_once,send_msg,
-     strlen(send_msg),0,
-     (struct sockaddr*)&udp_sock,
-     sizeof(struct sockaddr));
 
-  KPrintf("Send UDP msg: %s ", send_msg);
 
   while (1)
   {
     KPrintf("Lwip client is running.\n");
-    MdelayKTask(3000);
+
+    sendto(sock_udp_send_once,send_msg,
+     strlen(send_msg),0,
+     (struct sockaddr*)&udp_sock,
+     sizeof(struct sockaddr));
+
+    KPrintf("Send UDP msg: %s ", send_msg);
+
+    MdelayKTask(1000);
   }
 
 __exit: