diff --git a/common.go b/common.go
index 1d47185..a49d685 100644
--- a/common.go
+++ b/common.go
@@ -2,6 +2,12 @@ package rabbitmqrpc
 
 const DES_KEY = "mqbitrab"
 
+type MsgBody struct {
+	Exchange string
+	Key      string
+	Data     string
+}
+
 func rpc_server_conn(url ...string) (*RabbitmqServiceClient, error) {
 
 	var wx_rpc_url string = "127.0.0.1:7955"