diff --git a/src/rpc/inc/rpcHead.h b/src/rpc/inc/rpcHead.h
index 95204f72f6b825a8456c31fc6625bf6710f31209..dc0cac01435b33b98ca518ecd2314f18f70bc336 100644
--- a/src/rpc/inc/rpcHead.h
+++ b/src/rpc/inc/rpcHead.h
@@ -20,6 +20,7 @@
 extern "C" {
 #endif
 
+// server:0 client:1  tcp:2 udp:0
 #define RPC_CONN_UDPS   0
 #define RPC_CONN_UDPC   1
 #define RPC_CONN_TCPS   2
diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index 8226620c1b5287caede2f0f5090a75ae6b31e48a..deaf30f42ebf2464ac4696b29e04b29a7e59d3e7 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -137,13 +137,6 @@ static int     tsRpcRefId = -1;
 static int32_t tsRpcNum = 0;
 //static pthread_once_t tsRpcInit = PTHREAD_ONCE_INIT;
 
-// server:0 client:1  tcp:2 udp:0
-#define RPC_CONN_UDPS   0
-#define RPC_CONN_UDPC   1
-#define RPC_CONN_TCPS   2
-#define RPC_CONN_TCPC   3
-#define RPC_CONN_TCP    2
-
 void *(*taosInitConn[])(uint32_t ip, uint16_t port, char *label, int threads, void *fp, void *shandle) = {
     taosInitUdpConnection,
     taosInitUdpConnection,