diff --git a/cmd/rpc/open_im_msg/main.go b/cmd/rpc/open_im_msg/main.go
index 2c6d785d7..6c689033a 100644
--- a/cmd/rpc/open_im_msg/main.go
+++ b/cmd/rpc/open_im_msg/main.go
@@ -12,7 +12,7 @@ func main() {
 	rpcServer := rpcChat.NewRpcChatServer(*rpcPort)
 	// register widgets
 
-	// mock
+	// mock 注册发送前的拦截器
 	rpcServer.UseWidgetBeforSend(widget.MockBeforeSendHandler)
 
 	//
diff --git a/cmd/rpc/open_im_msg/widget/widget.go b/cmd/rpc/open_im_msg/widget/widget.go
index 9f9224a64..92d3c5e50 100644
--- a/cmd/rpc/open_im_msg/widget/widget.go
+++ b/cmd/rpc/open_im_msg/widget/widget.go
@@ -5,13 +5,17 @@ import (
 	pbChat "Open_IM/pkg/proto/chat"
 	"context"
 	"errors"
+	"fmt"
 )
 
 // MockBeforeSendHandler is a mock handle that handles custom logic before send msg.
 func MockBeforeSendHandler(ctx context.Context, pb *pbChat.SendMsgReq) (*pbChat.SendMsgResp, bool, error) {
+	fmt.Printf("MockBeforeSendHandler trigger,contentType:%d\n", pb.MsgData.GetContentType())
 	if pb.MsgData.ContentType == constant.Text {
 		msg := string(pb.MsgData.Content)
+		fmt.Printf("text msg:%s", msg)
 		if msg == "this is a m..m..mock msg" {
+			fmt.Println(".==>msg had banned")
 			return nil, false, errors.New("BANG! This msg has been banned by MockBeforeSendHandler")
 		}
 	}