diff --git a/lib/AppLoader.d.ts b/lib/AppLoader.d.ts
index 17e503f..49140e3 100644
--- a/lib/AppLoader.d.ts
+++ b/lib/AppLoader.d.ts
@@ -15,14 +15,14 @@ export declare class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt exten
     protected dataSubscriber?: DataSubscriber<ED, Cxt>;
     protected synchronizer?: Synchronizer<ED, Cxt>;
     protected contextBuilder: (store: DbStore<ED, Cxt>) => Cxt;
-    private nsSocket;
+    private nsSocket?;
     private requireSth;
     protected makeContext(cxtStr?: string, headers?: IncomingHttpHeaders): Promise<Cxt>;
     /**
      * 后台启动的configuration，统一放在这里读取
      */
     private getConfiguration;
-    constructor(path: string, nsSubscribe: Namespace, nsSocket: Namespace, nsServer?: Namespace);
+    constructor(path: string, nsSubscribe?: Namespace, nsSocket?: Namespace, nsServer?: Namespace);
     protected registerTrigger(trigger: Trigger<ED, keyof ED, Cxt>): void;
     protected initTriggers(): void;
     protected initSocket(): void;
diff --git a/src/AppLoader.ts b/src/AppLoader.ts
index a508c9a..bf1094f 100644
--- a/src/AppLoader.ts
+++ b/src/AppLoader.ts
@@ -29,7 +29,7 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
     protected dataSubscriber?: DataSubscriber<ED, Cxt>;
     protected synchronizer?: Synchronizer<ED, Cxt>;
     protected contextBuilder: (store: DbStore<ED, Cxt>) => Cxt;
-    private nsSocket: Namespace;
+    private nsSocket?: Namespace;
 
     private requireSth(filePath: string): any {
         const depFilePath = join(this.path, filePath);
@@ -85,7 +85,7 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
         };
     }
 
-    constructor(path: string, nsSubscribe: Namespace, nsSocket: Namespace, nsServer?: Namespace) {
+    constructor(path: string, nsSubscribe?: Namespace, nsSocket?: Namespace, nsServer?: Namespace) {
         super(path);
         const { dbConfig } = this.getConfiguration();
         const { storageSchema } = require(`${path}/lib/oak-app-domain/Storage`);