diff --git a/net/grpc/service/service.go b/net/grpc/service/service.go
index d469482..d24f235 100644
--- a/net/grpc/service/service.go
+++ b/net/grpc/service/service.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"git.hlsq.asia/mmorpg/service-common/discover"
 	"git.hlsq.asia/mmorpg/service-common/log"
+	"git.hlsq.asia/mmorpg/service-common/net/http/http_resp"
 	"git.hlsq.asia/mmorpg/service-common/utils"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
@@ -56,8 +57,13 @@ func (s *Base) Init(addr string, port int32) {
 							err = status.Error(codes.Internal, fmt.Sprintf("%v", r))
 						}
 					}()
-					resp, err = handler(ctx, req)
-					return
+					if usnReq, ok := req.(interface{ GetUSN() string }); ok {
+						usn := usnReq.GetUSN()
+						if !utils.ShouldBindUsn(ctx, &usn) {
+							return nil, http_resp.ParamError
+						}
+					}
+					return handler(ctx, req)
 				},
 			),
 			grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{