diff --git a/packages/core/src/Core.ts b/packages/core/src/Core.ts
index f04e2202..d240c4f3 100644
--- a/packages/core/src/Core.ts
+++ b/packages/core/src/Core.ts
@@ -13,7 +13,6 @@ import { ServiceContainer } from './Core/ServiceContainer';
 import { PluginManager } from './Core/PluginManager';
 import { IPlugin } from './Core/Plugin';
 import { WorldManager } from './ECS/WorldManager';
-import { registerInjectable } from './Core/DI';
 
 /**
  * 游戏引擎核心类
@@ -178,14 +177,9 @@ export class Core {
         this._poolManager = new PoolManager();
         this._serviceContainer.registerInstance(PoolManager, this._poolManager);
 
-        // 使用依赖注入自动注册WorldManager和SceneManager
-        // WorldManager会在构造时创建默认World
-        registerInjectable(this._serviceContainer, WorldManager);
-        this._worldManager = this._serviceContainer.resolve(WorldManager);
-
-        // SceneManager会通过@Inject自动获取WorldManager
-        registerInjectable(this._serviceContainer, SceneManager);
-        this._sceneManager = this._serviceContainer.resolve(SceneManager);
+        // 初始化场景管理器
+        this._sceneManager = new SceneManager();
+        this._serviceContainer.registerInstance(SceneManager, this._sceneManager);
 
         // 设置场景切换回调，通知调试管理器
         this._sceneManager.setSceneChangedCallback(() => {
@@ -194,6 +188,10 @@ export class Core {
             }
         });
 
+        // 初始化World管理器
+        this._worldManager = new WorldManager();
+        this._serviceContainer.registerInstance(WorldManager, this._worldManager);
+
         // 初始化插件管理器
         this._pluginManager = new PluginManager();
         this._pluginManager.initialize(this, this._serviceContainer);
@@ -647,7 +645,7 @@ export class Core {
             this._performanceMonitor.updateFPS(Time.deltaTime);
         }
 
-        // 更新所有@Updatable服务(包括TimerManager, WorldManager, SceneManager等)
+        // 更新所有可更新的服务
         const servicesStartTime = this._performanceMonitor.startMonitoring('Services.update');
         this._serviceContainer.updateAll(deltaTime);
         this._performanceMonitor.endMonitoring('Services.update', servicesStartTime, this._serviceContainer.getUpdatableCount());
@@ -655,6 +653,12 @@ export class Core {
         // 更新对象池管理器
         this._poolManager.update();
 
+        // 更新默认场景（通过 SceneManager）
+        this._sceneManager.update();
+
+        // 更新额外的 WorldManager
+        this._worldManager.updateAll();
+
         // 更新调试管理器（基于FPS的数据发送）
         if (this._debugManager) {
             this._debugManager.onFrameUpdate(deltaTime);
diff --git a/packages/core/src/ECS/SceneManager.ts b/packages/core/src/ECS/SceneManager.ts
index 62b3876d..8d1b2b50 100644
--- a/packages/core/src/ECS/SceneManager.ts
+++ b/packages/core/src/ECS/SceneManager.ts
@@ -3,10 +3,7 @@ import { ECSFluentAPI, createECSAPI } from './Core/FluentAPI';
 import { Time } from '../Utils/Time';
 import { createLogger } from '../Utils/Logger';
 import type { IService } from '../Core/ServiceContainer';
-import type { IUpdatable } from '../Types/IUpdatable';
 import { World } from './World';
-import { WorldManager } from './WorldManager';
-import { Injectable, Inject, Updatable } from '../Core/DI';
 
 /**
  * 单场景管理器
@@ -21,13 +18,15 @@ import { Injectable, Inject, Updatable } from '../Core/DI';
  * - 简单直观的API
  * - 支持延迟场景切换
  * - 自动管理ECS API
- * - 通过依赖注入获取WorldManager的默认World
  *
  * @example
  * ```typescript
  * // 初始化Core
  * Core.create({ debug: true });
  *
+ * // 创建场景管理器
+ * const sceneManager = new SceneManager();
+ *
  * // 设置场景
  * class GameScene extends Scene {
  *     initialize() {
@@ -36,22 +35,21 @@ import { Injectable, Inject, Updatable } from '../Core/DI';
  *     }
  * }
  *
- * Core.setScene(new GameScene());
+ * sceneManager.setScene(new GameScene());
  *
  * // 游戏循环
  * function gameLoop(deltaTime: number) {
- *     Core.update(deltaTime);  // 自动更新所有服务(包括SceneManager)
+ *     Core.update(deltaTime);      // 更新全局服务
+ *     sceneManager.update();       // 更新场景
  * }
  *
  * // 延迟切换场景（下一帧生效）
- * Core.loadScene(new MenuScene());
+ * sceneManager.loadScene(new MenuScene());
  * ```
  */
-@Injectable()
-@Updatable(10)
-export class SceneManager implements IService, IUpdatable {
+export class SceneManager implements IService {
     /**
-     * 内部默认World(从WorldManager获取)
+     * 内部默认World
      */
     private _defaultWorld: World;
 
@@ -80,18 +78,9 @@ export class SceneManager implements IService, IUpdatable {
      */
     private static readonly DEFAULT_SCENE_ID = '__main__';
 
-    /**
-     * 构造函数
-     *
-     * WorldManager通过依赖注入自动传入
-     *
-     * @param worldManager WorldManager实例,用于获取默认World
-     */
-    constructor(
-        @Inject(WorldManager) worldManager: WorldManager
-    ) {
-        // 使用WorldManager管理的默认World
-        this._defaultWorld = worldManager.getDefaultWorld();
+    constructor() {
+        this._defaultWorld = new World({ name: '__default__' });
+        this._defaultWorld.start();
     }
 
     /**
diff --git a/packages/core/src/ECS/WorldManager.ts b/packages/core/src/ECS/WorldManager.ts
index d04c6151..5296e8a9 100644
--- a/packages/core/src/ECS/WorldManager.ts
+++ b/packages/core/src/ECS/WorldManager.ts
@@ -1,8 +1,6 @@
 import { World, IWorldConfig } from './World';
 import { createLogger } from '../Utils/Logger';
 import type { IService } from '../Core/ServiceContainer';
-import type { IUpdatable } from '../Types/IUpdatable';
-import { Injectable, Updatable } from '../Core/DI';
 
 const logger = createLogger('WorldManager');
 
@@ -14,28 +12,21 @@ export interface IWorldManagerConfig {
      * 最大World数量
      */
     maxWorlds?: number;
-
+    
     /**
      * 是否自动清理空World
      */
     autoCleanup?: boolean;
-
+    
     /**
      * 清理间隔（毫秒）
      */
     cleanupInterval?: number;
-
+    
     /**
      * 是否启用调试模式
      */
     debug?: boolean;
-
-    /**
-     * 是否创建默认World(默认true)
-     *
-     * 当通过Core使用时应该为true,直接使用WorldManager时可设为false
-     */
-    createDefaultWorld?: boolean;
 }
 
 /**
@@ -66,18 +57,12 @@ export interface IWorldManagerConfig {
  *
  * // 游戏循环
  * function gameLoop(deltaTime: number) {
- *     Core.update(deltaTime);  // 自动更新所有@Updatable服务(包括WorldManager)
+ *     Core.update(deltaTime);
+ *     worldManager.updateAll();  // 更新所有活跃World
  * }
  * ```
  */
-@Injectable()
-@Updatable(5)
-export class WorldManager implements IService, IUpdatable {
-    /**
-     * 默认World的ID
-     */
-    public static readonly DEFAULT_WORLD_ID = '__default__';
-
+export class WorldManager implements IService {
     private readonly _config: IWorldManagerConfig;
     private readonly _worlds: Map<string, World> = new Map();
     private readonly _activeWorlds: Set<string> = new Set();
@@ -90,26 +75,16 @@ export class WorldManager implements IService, IUpdatable {
             autoCleanup: true,
             cleanupInterval: 30000, // 30秒
             debug: false,
-            createDefaultWorld: true,  // 默认创建
             ...config
         };
 
         // 默认启动运行状态
         this._isRunning = true;
 
-        // 如果配置要求,创建并注册默认World
-        if (this._config.createDefaultWorld) {
-            const defaultWorld = new World({ name: WorldManager.DEFAULT_WORLD_ID });
-            this._worlds.set(WorldManager.DEFAULT_WORLD_ID, defaultWorld);
-            this._activeWorlds.add(WorldManager.DEFAULT_WORLD_ID);
-            defaultWorld.start();
-        }
-
         logger.info('WorldManager已初始化', {
             maxWorlds: this._config.maxWorlds,
             autoCleanup: this._config.autoCleanup,
-            cleanupInterval: this._config.cleanupInterval,
-            defaultWorldCreated: this._config.createDefaultWorld
+            cleanupInterval: this._config.cleanupInterval
         });
 
         this.startCleanupTimer();
@@ -117,22 +92,6 @@ export class WorldManager implements IService, IUpdatable {
 
     // ===== World管理 =====
 
-    /**
-     * 获取默认World
-     *
-     * 默认World由WorldManager自动创建，供SceneManager使用。
-     * 此方法主要供SceneManager内部使用。
-     *
-     * @returns 默认World实例
-     */
-    public getDefaultWorld(): World {
-        const defaultWorld = this._worlds.get(WorldManager.DEFAULT_WORLD_ID);
-        if (!defaultWorld) {
-            throw new Error('默认World不存在，这不应该发生');
-        }
-        return defaultWorld;
-    }
-
     /**
      * 创建新World
      */
@@ -164,16 +123,8 @@ export class WorldManager implements IService, IUpdatable {
 
     /**
      * 移除World
-     *
-     * 注意:默认World不能被删除
      */
     public removeWorld(worldId: string): boolean {
-        // 防止删除默认World
-        if (worldId === WorldManager.DEFAULT_WORLD_ID) {
-            logger.warn('无法删除默认World');
-            return false;
-        }
-
         const world = this._worlds.get(worldId);
         if (!world) {
             return false;
@@ -246,12 +197,18 @@ export class WorldManager implements IService, IUpdatable {
     /**
      * 更新所有活跃的World
      *
-     * 此方法由ServiceContainer自动调用(@Updatable装饰器)
+     * 应该在每帧的游戏循环中调用。
      * 会自动更新所有活跃World的全局系统和场景。
      *
-     * @param deltaTime 帧时间间隔(未使用,保留用于接口兼容)
+     * @example
+     * ```typescript
+     * function gameLoop(deltaTime: number) {
+     *     Core.update(deltaTime);      // 更新全局服务
+     *     worldManager.updateAll();    // 更新所有World
+     * }
+     * ```
      */
-    public update(deltaTime?: number): void {
+    public updateAll(): void {
         if (!this._isRunning) return;
 
         for (const worldId of this._activeWorlds) {
diff --git a/packages/core/tests/ECS/Core/WorldCoreIntegration.test.ts b/packages/core/tests/ECS/Core/WorldCoreIntegration.test.ts
index 6ea14e3e..969a8851 100644
--- a/packages/core/tests/ECS/Core/WorldCoreIntegration.test.ts
+++ b/packages/core/tests/ECS/Core/WorldCoreIntegration.test.ts
@@ -47,6 +47,13 @@ class NetworkGlobalSystem implements IGlobalSystem {
 
 /**
  * World与Core集成测试
+ *
+ * 注意：v3.0重构后，Core不再直接管理Scene/World
+ * - 场景管理由 SceneManager 负责
+ * - 多世界管理由 WorldManager 负责
+ * - Core 仅负责全局服务（Timer、Performance等）
+ *
+ * 大部分旧的集成测试已移至 SceneManager.test.ts 和 WorldManager.test.ts
  */
 describe('World与Core集成测试', () => {
     let worldManager: WorldManager;
@@ -60,10 +67,8 @@ describe('World与Core集成测试', () => {
         Core.create({ debug: false });
 
         // WorldManager和SceneManager不再是单例
-        // SceneManager需要WorldManager的默认World,所以必须创建
-        worldManager = new WorldManager({ createDefaultWorld: true });
-        // SceneManager需要WorldManager实例
-        sceneManager = new SceneManager(worldManager);
+        worldManager = new WorldManager();
+        sceneManager = new SceneManager();
     });
 
     afterEach(() => {
@@ -104,8 +109,7 @@ describe('World与Core集成测试', () => {
             const world1 = worldManager.createWorld('world1');
             const world2 = worldManager.createWorld('world2');
 
-            // worldManager已包含默认World,所以总数是3
-            expect(worldManager.worldCount).toBe(3);
+            expect(worldManager.worldCount).toBe(2);
             expect(worldManager.getWorld('world1')).toBe(world1);
             expect(worldManager.getWorld('world2')).toBe(world2);
         });
@@ -133,7 +137,7 @@ describe('World与Core集成测试', () => {
 
             // 游戏循环
             Core.update(0.016);      // 更新全局服务
-            worldManager.update(); // 更新所有World
+            worldManager.updateAll(); // 更新所有World
 
             expect(world.isActive).toBe(true);
         });
@@ -146,7 +150,7 @@ describe('World与Core集成测试', () => {
             worldManager.setWorldActive('test-world', true);
 
             // 更新World
-            worldManager.update();
+            worldManager.updateAll();
 
             expect(globalSystem.syncCount).toBeGreaterThan(0);
         });
@@ -154,8 +158,8 @@ describe('World与Core集成测试', () => {
 
     describe('隔离性测试', () => {
         test('多个WorldManager实例应该完全隔离', () => {
-            const manager1 = new WorldManager({ createDefaultWorld: false });
-            const manager2 = new WorldManager({ createDefaultWorld: false });
+            const manager1 = new WorldManager();
+            const manager2 = new WorldManager();
 
             manager1.createWorld('world1');
             manager2.createWorld('world2');
@@ -171,10 +175,8 @@ describe('World与Core集成测试', () => {
         });
 
         test('多个SceneManager实例应该完全隔离', () => {
-            const wm1 = new WorldManager({ createDefaultWorld: true });
-            const wm2 = new WorldManager({ createDefaultWorld: true });
-            const sm1 = new SceneManager(wm1);
-            const sm2 = new SceneManager(wm2);
+            const sm1 = new SceneManager();
+            const sm2 = new SceneManager();
 
             const scene1 = new Scene();
             const scene2 = new Scene();
@@ -188,8 +190,6 @@ describe('World与Core集成测试', () => {
             // 清理
             sm1.destroy();
             sm2.destroy();
-            wm1.destroy();
-            wm2.destroy();
         });
     });
 });
diff --git a/packages/core/tests/ECS/WorldManager.test.ts b/packages/core/tests/ECS/WorldManager.test.ts
index 64ffbbad..0285fd2c 100644
--- a/packages/core/tests/ECS/WorldManager.test.ts
+++ b/packages/core/tests/ECS/WorldManager.test.ts
@@ -42,8 +42,7 @@ describe('WorldManager', () => {
 
     beforeEach(() => {
         // WorldManager不再是单例，直接创建新实例
-        // 测试时不创建默认World
-        worldManager = new WorldManager({ createDefaultWorld: false });
+        worldManager = new WorldManager();
     });
 
     afterEach(() => {
@@ -60,8 +59,8 @@ describe('WorldManager', () => {
 
     describe('实例化', () => {
         test('可以创建多个独立的WorldManager实例', () => {
-            const manager1 = new WorldManager({ createDefaultWorld: false });
-            const manager2 = new WorldManager({ createDefaultWorld: false });
+            const manager1 = new WorldManager();
+            const manager2 = new WorldManager();
 
             expect(manager1).not.toBe(manager2);
 
@@ -77,8 +76,7 @@ describe('WorldManager', () => {
             const config: IWorldManagerConfig = {
                 maxWorlds: 10,
                 autoCleanup: true,
-                debug: false,
-                createDefaultWorld: false
+                debug: false
             };
 
             const instance = new WorldManager(config);
@@ -123,7 +121,7 @@ describe('WorldManager', () => {
         });
         
         test('超出最大World数量应该抛出错误', () => {
-            const limitedManager = new WorldManager({ maxWorlds: 2, createDefaultWorld: false });
+            const limitedManager = new WorldManager({ maxWorlds: 2 });
 
             limitedManager.createWorld('world1');
             limitedManager.createWorld('world2');
@@ -430,8 +428,7 @@ describe('WorldManager', () => {
             const invalidConfig: IWorldManagerConfig = {
                 maxWorlds: -1,
                 autoCleanup: true,
-                debug: true,
-                createDefaultWorld: false
+                debug: true
             };
 
             const manager = new WorldManager(invalidConfig);
@@ -445,8 +442,7 @@ describe('WorldManager', () => {
             const config: IWorldManagerConfig = {
                 maxWorlds: 3,
                 autoCleanup: true,
-                debug: true,
-                createDefaultWorld: false
+                debug: true
             };
 
             const manager = new WorldManager(config);