diff --git a/xray/trojan.go b/xray/trojan.go
index 7ce339e..6db185a 100644
--- a/xray/trojan.go
+++ b/xray/trojan.go
@@ -213,6 +213,11 @@ func (t *Trojan) BuildOutboundDetourConfig(allowInsecure bool) (*conf.OutboundDe
 		}
 		break
 	case "grpc":
+		if len(t.ServiceName) > 0 {
+			if t.ServiceName[0] == '/' {
+				t.ServiceName = t.ServiceName[1:]
+			}
+		}
 		multiMode := false
 		if t.Mode != "gun" {
 			multiMode = true
diff --git a/xray/vless.go b/xray/vless.go
index 408be25..bc5c682 100644
--- a/xray/vless.go
+++ b/xray/vless.go
@@ -217,9 +217,18 @@ func (v *Vless) BuildOutboundDetourConfig(allowInsecure bool) (*conf.OutboundDet
 			s.HTTPSettings.Host = &h
 		}
 	case "grpc":
+		if len(v.ServiceName) > 0 {
+			if v.ServiceName[0] == '/' {
+				v.ServiceName = v.ServiceName[1:]
+			}
+		}
+		multiMode := false
+		if v.Type != "gun" {
+			multiMode = true
+		}
 		s.GRPCConfig = &conf.GRPCConfig{
 			ServiceName:         v.ServiceName,
-			MultiMode:           false,
+			MultiMode:           multiMode,
 			IdleTimeout:         60,
 			HealthCheckTimeout:  20,
 			PermitWithoutStream: false,