diff --git a/packages/iframe-bridge/README.md b/packages/iframe-bridge/README.md
new file mode 100644
index 0000000..a56495a
--- /dev/null
+++ b/packages/iframe-bridge/README.md
@@ -0,0 +1,141 @@
+# @teres/iframe-bridge
+
+一个基于 [Penpal](https://github.com/Aaronius/penpal) 的轻量 iframe 通信桥，帮助宿主页面与子应用（iframe）安全、稳定地进行双向方法调用与状态同步。
+
+## 为什么需要它
+- 将跨项目的交互（如语言切换、导航、关闭、就绪通知）抽象为清晰的 API。
+- 在 Monorepo 或多项目场景下，提供“宿主 ↔ 子应用”的统一通信约定。
+- 屏蔽 Penpal 细节，专注业务方法与类型定义。
+
+## 安装与版本
+- 已在工作空间内作为包使用（`packages/iframe-bridge`）。
+- 依赖：`penpal@^6.2.1`。
+
+## 目录结构
+```
+packages/iframe-bridge/
+├── package.json
+├── README.md
+└── src/
+    ├── index.ts       # 入口聚合与导出（不含业务逻辑）
+    ├── types.ts       # 对外类型：HostApi、ChildApi
+    ├── path.ts        # 路径转换与是否嵌入判断
+    ├── client.ts      # 子端到父端的连接与客户端方法
+    ├── host.ts        # 宿主侧创建与管理与子端的连接
+    └── logger.ts      # 统一日志工具
+```
+
+## 核心概念
+- Host（宿主）：包含 `iframe` 的父页面。
+- Child（子端）：被嵌入在 `iframe` 中的子应用。子端暴露方法给宿主调用。
+- Penpal：在宿主与子端之间建立安全的双向 RPC（方法调用）连接。
+
+## 快速上手
+
+### 宿主侧（Host）示例：创建连接并缓存子端引用
+```ts
+import { createPenpalHostBridge } from '@teres/iframe-bridge';
+
+// iframeRef 指向你页面中的 <iframe>
+const { child, destroy } = await createPenpalHostBridge({
+  iframe: iframeRef.current!,
+  methods: {
+    // 暴露给“子端”可调用的宿主方法
+    navigate: (path: string) => {
+      // 宿主导航逻辑
+    },
+    close: () => {
+      // 关闭或返回逻辑
+    },
+    agentReady: (agentId?: string) => {
+      // 子端就绪通知处理
+    },
+  },
+});
+
+// child 是一个 Promise，解析后可拿到子端暴露的方法（例如 changeLanguage）
+await child; // 也可以缓存后续使用
+
+// 组件卸载或需要重建连接时
+await destroy();
+```
+
+在你的项目中（如 `src/pages/ragflow/iframe.tsx`）通常会把 `child` 引用存到一个管理器，供语言切换等场景调用。
+
+### 子端侧（Child）示例：暴露方法并与宿主交互
+```ts
+import Bridge from '@teres/iframe-bridge';
+
+// 在子应用初始化时调用（例如根组件 useEffect 中）
+Bridge.initChildBridge({
+  // 暴露给“宿主”可调用的子端方法
+  methods: {
+    changeLanguage: async (lang: string) => {
+      // 你的 i18n 切换逻辑，例如：
+      // await i18n.changeLanguage(lang);
+    },
+  },
+});
+
+// 主动与宿主交互（可选）
+Bridge.clientReady();
+Bridge.clientNavigate('/some/path');
+Bridge.clientClose();
+```
+
+## API 参考
+
+### 类型（types.ts）
+- `HostApi`
+  - `navigate(path: string): void`
+  - `close(): void`
+  - `agentReady(agentId?: string): void`
+- `ChildApi`
+  - `changeLanguage(lang: string): Promise<void>`
+
+### 路径与嵌入（path.ts）
+- `isEmbedded(): boolean` 判断当前窗口是否运行在 iframe 中（且需要通信）。
+- `toHostPath(childPath: string): string` 将子端路径转换为宿主侧路由前缀路径。
+- `toChildPath(hostPath: string): string` 将宿主路径映射回子端路径。
+
+### 子端客户端方法（client.ts）
+- `getClientHostApi(): Promise<HostApi>` 建立并缓存与宿主的连接。
+- `clientNavigate(path: string): Promise<void>` 请求宿主导航。
+- `clientClose(): Promise<void>` 请求宿主关闭或返回。
+- `clientReady(agentId?: string): Promise<void>` 通知宿主子端就绪。
+- `initChildBridge(options: { methods: Partial<ChildApi> }): Promise<void>` 在子端暴露方法供宿主调用（如 `changeLanguage`）。
+
+### 宿主桥接（host.ts）
+- `createPenpalHostBridge({ iframe, methods })`
+  - `iframe: HTMLIFrameElement`
+  - `methods: Partial<HostApi>` 暴露给子端可调用的宿主方法。
+  - 返回：`{ child: Promise<ChildExposed>, destroy: () => Promise<void> }`
+    - `child`：解析后可获得子端暴露的方法（如 `changeLanguage`）。
+    - `destroy`：销毁连接与事件监听。
+
+## 语言联动最佳实践
+1. 子端在初始化中通过 `initChildBridge` 暴露 `changeLanguage`。
+2. 宿主在创建连接后缓存 `child` 引用。
+3. 宿主语言切换组件在变更时调用：
+```ts
+const child = await childPromise; // 取到缓存的子端引用
+await child.changeLanguage(nextLang);
+```
+
+## 调试与排错
+- 确保 iframe 与宿主同源或允许跨源通信（Penpal 支持跨源，但需正确 URL）。
+- 连接建立需要子端加载完成；在子端 `initChildBridge` 之前调用子端方法会报错或超时。
+- 若需要观察连接过程，可在 `logger.ts` 中启用调试日志或在业务代码中打点。
+- 组件卸载时务必调用 `destroy()`，避免内存泄漏或事件残留。
+
+## 设计说明
+- 入口 `index.ts` 仅做导出聚合，具体逻辑按职责拆分到 `types/logger/path/client/host`。
+- 子端侧会缓存一次宿主连接，避免重复握手，提高性能与稳定性。
+
+## 常见问题
+- 调用时机过早：请在子端完成初始化（`initChildBridge`）后再由宿主调用子端方法。
+- 路径映射：`toHostPath`/`toChildPath` 默认适配当前项目前缀，如需自定义可扩展配置模块。
+- 异步方法：所有跨端调用均为异步，注意 `await` 与错误处理。
+
+---
+若你需要把路径前缀改为可配置项或扩展更多方法（如主题切换、会话同步），欢迎提 issue 或继续迭代。
\ No newline at end of file
diff --git a/packages/iframe-bridge/src/client.ts b/packages/iframe-bridge/src/client.ts
new file mode 100644
index 0000000..628101c
--- /dev/null
+++ b/packages/iframe-bridge/src/client.ts
@@ -0,0 +1,98 @@
+/**
+ * 子端（iframe 内）到宿主的客户端方法集合。
+ * - 负责与父窗口建立并缓存 Penpal 连接
+ * - 提供便捷的客户端调用：navigate/close/ready
+ */
+import { connectToParent } from 'penpal';
+import type { HostApi, ChildApi } from './types';
+import { isEmbedded } from './path';
+import { log } from './logger';
+
+// Cached Penpal connections
+// 缓存与宿主的连接，以避免重复握手
+let clientHostApiPromise: Promise<HostApi> | null = null;
+
+/** Create a Penpal connection from child to parent and cache the Host API. */
+/**
+ * 建立从子端到父端的 Penpal 连接，并返回宿主 HostApi（带缓存）。
+ * @param options.parentOrigin 可选，宿主的 origin（默认使用当前 window.location.origin）。
+ */
+export function getClientHostApi(options?: { parentOrigin?: string }): Promise<HostApi> {
+  if (!isEmbedded()) {
+    log('getClientHostApi() aborted: not embedded');
+    return Promise.reject(new Error('Not embedded'));
+  }
+  if (!clientHostApiPromise) {
+    const parentOrigin = options?.parentOrigin ?? window.location.origin;
+    log('getClientHostApi() connecting to parent', { parentOrigin });
+    clientHostApiPromise = connectToParent<HostApi>({ parentOrigin }).promise.then((host) => {
+      log('getClientHostApi() connected', {
+        hasNavigate: typeof host.navigate === 'function',
+        hasClose: typeof host.close === 'function',
+      });
+      return host;
+    });
+  }
+  return clientHostApiPromise;
+}
+
+/**
+ * 请求宿主进行导航。
+ * @param to 目标路径（会由宿主自行处理前缀与实际路由规则）
+ */
+export async function clientNavigate(to: string): Promise<void> {
+  log('clientNavigate() begin', { to });
+  const host = await getClientHostApi();
+  await host.navigate(to);
+  log('clientNavigate() done', { to });
+}
+
+/**
+ * 请求宿主执行关闭或返回操作。
+ */
+export async function clientClose(): Promise<void> {
+  log('clientClose() begin');
+  const host = await getClientHostApi();
+  log('clientClose() host api', {
+    hasClose: typeof host.close === 'function',
+  });
+  await host.close();
+  log('clientClose() done');
+}
+
+/**
+ * 通知宿主：子端已就绪（可携带 agentId 等信息）。
+ */
+export async function clientReady(payload?: any): Promise<void> {
+  log('clientReady() begin', { payload });
+  const host = await getClientHostApi();
+  const agentReady = host.agentReady;
+  const hasAgentReady = typeof agentReady === 'function';
+  log('clientReady() host agentReady', { hasAgentReady });
+  if (hasAgentReady) await agentReady!(payload);
+  log('clientReady() done');
+}
+
+/**
+ * 子应用初始化：暴露 ChildApi 给宿主，并获取宿主 HostApi（用于后续 clientNavigate、clientClose 等）。
+ * 如果已调用过 getClientHostApi，会复用同一连接。
+ */
+/**
+ * 子应用初始化：
+ * - 暴露 ChildApi 给宿主（如 changeLanguage）
+ * - 并获取宿主 HostApi（复用同一连接）
+ */
+export function initChildBridge(params: {
+  methods?: ChildApi;
+  parentOrigin?: string;
+}) {
+  const parentOrigin = params.parentOrigin ?? window.location.origin;
+  log('initChildBridge() start', { parentOrigin, hasMethods: !!params.methods });
+  const connection = connectToParent<HostApi>({ parentOrigin, methods: params.methods as any });
+  // 设置并复用 clientHostApiPromise
+  clientHostApiPromise = connection.promise;
+  connection.promise
+    .then(() => log('initChildBridge() parent connected'))
+    .catch((err) => log('initChildBridge() connect error', err));
+  return connection.promise;
+}
\ No newline at end of file
diff --git a/packages/iframe-bridge/src/host.ts b/packages/iframe-bridge/src/host.ts
new file mode 100644
index 0000000..2458de1
--- /dev/null
+++ b/packages/iframe-bridge/src/host.ts
@@ -0,0 +1,38 @@
+/**
+ * 宿主（父窗口）与子端（iframe）之间的桥接创建。
+ * - 绑定 iframe 元素，暴露宿主方法给子端调用
+ * - 返回 child Promise（解析为子端暴露的方法）与 destroy 销毁函数
+ */
+import { connectToChild } from 'penpal';
+import type { HostApi, ChildApi } from './types';
+import { log } from './logger';
+
+/** Establish Penpal host bridge bound to an iframe and expose Host API to child. */
+/**
+ * 建立宿主侧 Penpal 桥接并暴露 HostApi。
+ * @param params.iframe 目标 iframe 元素
+ * @param params.origin 可选，子端 origin（默认当前 window.location.origin）
+ * @param params.methods 宿主暴露给子端的方法集合
+ * @returns `{ child, destroy }`
+ *   - `child`: Promise<ChildApiResolved>，解析后可直接调用子端暴露的方法（如 changeLanguage）
+ *   - `destroy`: 断开连接与清理监听器
+ */
+export function createPenpalHostBridge(params: {
+  iframe: HTMLIFrameElement;
+  origin?: string;
+  methods: HostApi;
+}) {
+  const childOrigin = params.origin ?? window.location.origin;
+  log('createPenpalHostBridge() start', { childOrigin });
+  const connection = connectToChild<ChildApi>({ iframe: params.iframe, childOrigin, methods: params.methods as any });
+  connection.promise
+    .then(() => log('createPenpalHostBridge() child connected'))
+    .catch((err) => log('createPenpalHostBridge() connect error', err));
+  return {
+    child: connection.promise,
+    destroy: () => {
+      log('createPenpalHostBridge() destroy');
+      return connection.destroy?.();
+    },
+  };
+}
\ No newline at end of file
diff --git a/packages/iframe-bridge/src/index.ts b/packages/iframe-bridge/src/index.ts
index af0d177..fa50121 100644
--- a/packages/iframe-bridge/src/index.ts
+++ b/packages/iframe-bridge/src/index.ts
@@ -1,149 +1,31 @@
+// 入口文件：仅聚合与导出 API，不承载具体逻辑
+export type { HostApi, ChildApi } from './types';
+export { isEmbedded, toHostPath, toChildPath } from './path';
+export {
+  getClientHostApi,
+  clientNavigate,
+  clientClose,
+  clientReady,
+  initChildBridge,
+} from './client';
+export { createPenpalHostBridge } from './host';
+
+// 默认导出一个聚合对象：
+// - 兼容某些只识别 default 的打包方案或联邦场景
+// - 同时保留命名导出，建议优先使用命名导出
+import { isEmbedded, toHostPath, toChildPath } from './path';
+import {
+  getClientHostApi,
+  clientNavigate,
+  clientClose,
+  clientReady,
+  initChildBridge,
+} from './client';
+import { createPenpalHostBridge } from './host';
+
 /**
- * @teres/iframe-bridge
- * Penpal-based utilities for host ↔ iframe communication,
- * plus minimal helpers for embed detection and path conversion.
+ * 默认聚合导出对象：包含全部对外 API。
  */
-import { connectToChild, connectToParent } from 'penpal';
-
-// Penpal RPC API definitions
-export interface HostApi {
-  navigate: (to: string) => void;
-  close: () => void;
-  agentReady?: (payload?: any) => void;
-}
-
-export interface ChildApi {
-  navigate?: (to: string) => void;
-  close?: () => void;
-  ready?: (payload?: any) => void;
-}
-
-// Unified logger for debugging host/child interactions
-const LOG_PREFIX = '[@teres/iframe-bridge]';
-function log(...args: any[]) {
-  try {
-    // eslint-disable-next-line no-console
-    console.log(LOG_PREFIX, ...args);
-  } catch {}
-}
-
-function safePathname(): string {
-  try {
-    const p = window.location?.pathname || '';
-    log('safePathname()', p);
-    return p;
-  } catch {
-    log('safePathname() error, return empty pathname');
-    return '';
-  }
-}
-
-function isInIframe(): boolean {
-  try {
-    const inIframe = window.self !== window.top;
-    log('isInIframe()', inIframe);
-    return inIframe;
-  } catch {
-    // Cross-origin access throws, treat as embedded
-    log('isInIframe() cross-origin error, treat as embedded');
-    return true;
-  }
-}
-
-export function isEmbedded(): boolean {
-  const path = safePathname();
-  const inIframe = isInIframe();
-  const embedded = path.includes('/route-ragflow') || inIframe;
-  log('isEmbedded()', { path, inIframe, embedded });
-  return embedded;
-}
-
-/** Add "/ragflow" prefix when targeting host routes. */
-export function toHostPath(to: string): string {
-  const normalized = to.startsWith('/') ? to : `/${to}`;
-  const target = normalized.startsWith('/route-ragflow') ? normalized : `/ragflow${normalized}`;
-  log('toHostPath()', { input: to, normalized, target });
-  return target;
-}
-
-/** Remove leading "/route-ragflow" prefix when targeting child routes. */
-export function toChildPath(to: string): string {
-  const target = to.replace(/^\/route-ragflow/, '') || '/';
-  log('toChildPath()', { input: to, target });
-  return target;
-}
-
-// Cached Penpal connections
-let clientHostApiPromise: Promise<HostApi> | null = null;
-
-/** Create a Penpal connection from child to parent and cache the Host API. */
-export function getClientHostApi(options?: { parentOrigin?: string }): Promise<HostApi> {
-  if (!isEmbedded()) {
-    log('getClientHostApi() aborted: not embedded');
-    return Promise.reject(new Error('Not embedded'));
-  }
-  if (!clientHostApiPromise) {
-    const parentOrigin = options?.parentOrigin ?? window.location.origin;
-    log('getClientHostApi() connecting to parent', { parentOrigin });
-    clientHostApiPromise = connectToParent<HostApi>({ parentOrigin }).promise.then((host) => {
-      log('getClientHostApi() connected', {
-        hasNavigate: typeof host.navigate === 'function',
-        hasClose: typeof host.close === 'function',
-      });
-      return host;
-    });
-  }
-  return clientHostApiPromise;
-}
-
-export async function clientNavigate(to: string): Promise<void> {
-  log('clientNavigate() begin', { to });
-  const host = await getClientHostApi();
-  await host.navigate(to);
-  log('clientNavigate() done', { to });
-}
-
-export async function clientClose(): Promise<void> {
-  log('clientClose() begin');
-  const host = await getClientHostApi();
-  log('clientClose() host api', {
-    hasClose: typeof host.close === 'function',
-  });
-  await host.close();
-  log('clientClose() done');
-}
-
-export async function clientReady(payload?: any): Promise<void> {
-  log('clientReady() begin', { payload });
-  const host = await getClientHostApi();
-  const agentReady =  host.agentReady;
-  const hasAgentReady = typeof agentReady === 'function';
-  log('clientReady() host agentReady', { hasAgentReady });
-  if (hasAgentReady) await agentReady!(payload);
-  log('clientReady() done');
-}
-
-/** Establish Penpal host bridge bound to an iframe and expose Host API to child. */
-export function createPenpalHostBridge(params: {
-  iframe: HTMLIFrameElement;
-  origin?: string;
-  methods: HostApi;
-}) {
-  const childOrigin = params.origin ?? window.location.origin;
-  log('createPenpalHostBridge() start', { childOrigin });
-  const connection = connectToChild<ChildApi>({ iframe: params.iframe, childOrigin, methods: params.methods as any });
-  connection.promise.then(() => log('createPenpalHostBridge() child connected')).catch((err) => log('createPenpalHostBridge() connect error', err));
-  return {
-    child: connection.promise,
-    destroy: () => {
-      log('createPenpalHostBridge() destroy');
-      return connection.destroy?.();
-    },
-  };
-}
-
-// Provide a default export with all APIs to maximize compatibility with bundlers
-// that prefer default-only federation or mis-handle named ESM exports in dev.
 const bridge = {
   isEmbedded,
   toHostPath,
@@ -153,6 +35,7 @@ const bridge = {
   clientClose,
   clientReady,
   createPenpalHostBridge,
+  initChildBridge,
 };
 
 export default bridge;
diff --git a/packages/iframe-bridge/src/logger.ts b/packages/iframe-bridge/src/logger.ts
new file mode 100644
index 0000000..55a5814
--- /dev/null
+++ b/packages/iframe-bridge/src/logger.ts
@@ -0,0 +1,15 @@
+/**
+ * 统一日志前缀，便于在控制台筛选相关输出。
+ */
+export const LOG_PREFIX = '[@teres/iframe-bridge]';
+
+/**
+ * 简单的日志输出封装：
+ * - 在某些环境下 console 可能被拦截，故使用 try/catch。
+ */
+export function log(...args: any[]) {
+  try {
+    // eslint-disable-next-line no-console
+    console.log(LOG_PREFIX, ...args);
+  } catch {}
+}
\ No newline at end of file
diff --git a/packages/iframe-bridge/src/path.ts b/packages/iframe-bridge/src/path.ts
new file mode 100644
index 0000000..827661c
--- /dev/null
+++ b/packages/iframe-bridge/src/path.ts
@@ -0,0 +1,69 @@
+/**
+ * 路径与嵌入状态相关的工具函数：
+ * - 判断是否处于 iframe 场景（需进行跨窗口通信）
+ * - 提供宿主/子端路径的前缀转换
+ */
+import { log } from './logger';
+
+/**
+ * 安全获取当前窗口的 pathname，避免跨域等异常导致报错。
+ */
+function safePathname(): string {
+  try {
+    const p = window.location?.pathname || '';
+    log('safePathname()', p);
+    return p;
+  } catch {
+    log('safePathname() error, return empty pathname');
+    return '';
+  }
+}
+
+/**
+ * 判断是否运行在 iframe 中。
+ * 如因跨域访问 window.top 抛错，则视为在 iframe 中（embedded）。
+ */
+function isInIframe(): boolean {
+  try {
+    const inIframe = window.self !== window.top;
+    log('isInIframe()', inIframe);
+    return inIframe;
+  } catch {
+    // Cross-origin access throws, treat as embedded
+    log('isInIframe() cross-origin error, treat as embedded');
+    return true;
+  }
+}
+
+/**
+ * 是否处于“嵌入模式”：
+ * - 存在 '/route-ragflow' 路径标识 或
+ * - 运行在 iframe 中
+ */
+export function isEmbedded(): boolean {
+  const path = safePathname();
+  const inIframe = isInIframe();
+  const embedded = path.includes('/route-ragflow') || inIframe;
+  log('isEmbedded()', { path, inIframe, embedded });
+  return embedded;
+}
+
+/**
+ * 将子端路由转换为宿主路由（添加宿主前缀）。
+ * 默认会为路径添加 '/ragflow' 前缀。
+ */
+export function toHostPath(to: string): string {
+  const normalized = to.startsWith('/') ? to : `/${to}`;
+  const target = normalized.startsWith('/route-ragflow') ? normalized : `/ragflow${normalized}`;
+  log('toHostPath()', { input: to, normalized, target });
+  return target;
+}
+
+/**
+ * 将宿主路由转换回子端路由（去除 '/route-ragflow' 前缀）。
+ */
+export function toChildPath(to: string): string {
+  const target = to.replace(/^\/route-ragflow/, '') || '/';
+  log('toChildPath()', { input: to, target });
+  return target;
+}
\ No newline at end of file
diff --git a/packages/iframe-bridge/src/types.ts b/packages/iframe-bridge/src/types.ts
new file mode 100644
index 0000000..bad440c
--- /dev/null
+++ b/packages/iframe-bridge/src/types.ts
@@ -0,0 +1,22 @@
+/**
+ * Penpal RPC API 定义（宿主与子端共享的类型）。
+ */
+export interface HostApi {
+  /** 宿主导航到指定路径 */
+  navigate: (to: string) => void;
+  /** 宿主执行关闭或返回动作 */
+  close: () => void;
+  /** 接收子端就绪通知（可携带 agentId 等信息） */
+  agentReady?: (payload?: any) => void;
+}
+
+export interface ChildApi {
+  /** 子端主动请求宿主导航（若需要） */
+  navigate?: (to: string) => void;
+  /** 子端主动请求宿主关闭（若需要） */
+  close?: () => void;
+  /** 子端向宿主发送就绪事件（若需要） */
+  ready?: (payload?: any) => void;
+  /** 子应用语言切换（例如 'zh' | 'en' | 'zh-TRADITIONAL'） */
+  changeLanguage?: (lng: string) => Promise<void> | void;
+}
\ No newline at end of file
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1d8da6d..641044d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -536,9 +536,6 @@ importers:
       '@types/react-syntax-highlighter':
         specifier: ^15.5.11
         version: 15.5.13
-      '@types/testing-library__jest-dom':
-        specifier: ^6.0.0
-        version: 6.0.0
       '@types/uuid':
         specifier: ^9.0.8
         version: 9.0.8
@@ -4253,10 +4250,6 @@ packages:
   '@types/stylis@4.2.7':
     resolution: {integrity: sha512-VgDNokpBoKF+wrdvhAAfS55OMQpL6QRglwTwNC3kIgBrzZxA4WsFj+2eLfEA/uMUDzBcEhYmjSbwQakn/i3ajA==}
 
-  '@types/testing-library__jest-dom@6.0.0':
-    resolution: {integrity: sha512-bnreXCgus6IIadyHNlN/oI5FfX4dWgvGhOPvpr7zzCYDGAPIfvyIoAozMBINmhmsVuqV0cncejF2y5KC7ScqOg==}
-    deprecated: This is a stub types definition. @testing-library/jest-dom provides its own type definitions, so you do not need this installed.
-
   '@types/tough-cookie@4.0.5':
     resolution: {integrity: sha512-/Ad8+nIOV7Rl++6f1BdKxFSMgmoqEoYbHRpPcx3JEfv8VRsQe9Z4mCXeJBzxs7mbHY/XOZZuXlRNfhpVPbs6ZA==}
 
@@ -16122,10 +16115,6 @@ snapshots:
 
   '@types/stylis@4.2.7': {}
 
-  '@types/testing-library__jest-dom@6.0.0':
-    dependencies:
-      '@testing-library/jest-dom': 6.9.1
-
   '@types/tough-cookie@4.0.5': {}
 
   '@types/trusted-types@2.0.7':
diff --git a/ragflow_web/src/app.tsx b/ragflow_web/src/app.tsx
index df4aed3..510c141 100644
--- a/ragflow_web/src/app.tsx
+++ b/ragflow_web/src/app.tsx
@@ -24,6 +24,8 @@ import { SidebarProvider } from './components/ui/sidebar';
 import { TooltipProvider } from './components/ui/tooltip';
 import { ThemeEnum } from './constants/common';
 import storage from './utils/authorization-util';
+import Bridge from '@teres/iframe-bridge';
+import { LanguageAbbreviationMap, LanguageTranslationMap } from './constants/common';
 
 dayjs.extend(customParseFormat);
 dayjs.extend(advancedFormat);
@@ -99,6 +101,21 @@ const RootProvider = ({ children }: React.PropsWithChildren) => {
     if (lng) {
       i18n.changeLanguage(lng);
     }
+    // 在嵌入模式下，向父应用暴露 changeLanguage 方法以支持跨项目语言同步
+    if (Bridge.isEmbedded()) {
+      Bridge.initChildBridge({
+        methods: {
+          changeLanguage: (nextLng: string) => {
+            // 兼容传入缩写（en/zh/...）或显示名（English/Chinese/...）
+            const isAbbr = !!LanguageAbbreviationMap[nextLng as keyof typeof LanguageAbbreviationMap];
+            const resolved = isAbbr
+              ? nextLng
+              : LanguageTranslationMap[nextLng as keyof typeof LanguageTranslationMap] || nextLng;
+            i18n.changeLanguage(resolved);
+          },
+        },
+      });
+    }
   }, []);
 
   return (
diff --git a/ragflow_web/src/components/theme-provider.tsx b/ragflow_web/src/components/theme-provider.tsx
index 2589857..4ae554a 100644
--- a/ragflow_web/src/components/theme-provider.tsx
+++ b/ragflow_web/src/components/theme-provider.tsx
@@ -21,7 +21,7 @@ const ThemeProviderContext = createContext<ThemeProviderState>(initialState);
 
 export function ThemeProvider({
   children,
-  defaultTheme = ThemeEnum.Dark,
+  defaultTheme = ThemeEnum.Light,
   storageKey = 'vite-ui-theme',
   ...props
 }: ThemeProviderProps) {
diff --git a/src/components/LanguageSwitcher.tsx b/src/components/LanguageSwitcher.tsx
index c8062db..61c113b 100644
--- a/src/components/LanguageSwitcher.tsx
+++ b/src/components/LanguageSwitcher.tsx
@@ -3,6 +3,7 @@ import { useTranslation } from 'react-i18next';
 import { Button, Menu, MenuItem } from '@mui/material';
 import { useLanguageSetting } from '@/hooks/setting-hooks';
 import logger from '@/utils/logger';
+import { changeChildLanguage } from '@/iframe/bridgeManager';
 import { LanguageAbbreviation, LanguageAbbreviationMap } from '@/constants/common';
 
 interface LanguageSwitcherProps {
@@ -27,6 +28,8 @@ const LanguageSwitcher: React.FC<LanguageSwitcherProps> = ({ textColor = '#fff'
     try {
       await changeLanguage(language);
       i18n.changeLanguage(language);
+      // 同步通知 iframe 子应用切换语言（如果存在）
+      changeChildLanguage(language);
       handleClose();
     } catch (error) {
       logger.error('更新语言设置失败:', error);
diff --git a/src/hooks/logic-hooks.ts b/src/hooks/logic-hooks.ts
new file mode 100644
index 0000000..c3822d8
--- /dev/null
+++ b/src/hooks/logic-hooks.ts
@@ -0,0 +1 @@
+// logic-hooks 逻辑钩子
\ No newline at end of file
diff --git a/src/iframe/bridgeManager.ts b/src/iframe/bridgeManager.ts
new file mode 100644
index 0000000..060bdb7
--- /dev/null
+++ b/src/iframe/bridgeManager.ts
@@ -0,0 +1,23 @@
+import type { ChildApi } from '@teres/iframe-bridge';
+import logger from '@/utils/logger';
+
+let childPromise: Promise<ChildApi> | null = null;
+
+export function setChildPromise(promise: Promise<ChildApi>) {
+  childPromise = promise;
+}
+
+export function clearChildPromise() {
+  childPromise = null;
+}
+
+export async function changeChildLanguage(lng: string) {
+  if (!childPromise) return;
+  try {
+    const child = await childPromise;
+    // @ts-ignore
+    await child?.changeLanguage?.(lng);
+  } catch (err) {
+    logger.warn('changeChildLanguage failed', err);
+  }
+}
\ No newline at end of file
diff --git a/src/pages/ragflow/agent.tsx b/src/pages/ragflow/agent.tsx
index 4c35ccd..5cc3425 100644
--- a/src/pages/ragflow/agent.tsx
+++ b/src/pages/ragflow/agent.tsx
@@ -1,6 +1,7 @@
 import { useEffect, useMemo, useRef } from 'react';
 import { useNavigate, useParams } from 'react-router-dom';
 import { createPenpalHostBridge } from '@teres/iframe-bridge';
+import { setChildPromise, clearChildPromise } from '@/iframe/bridgeManager';
 import logger from '@/utils/logger';
 
 export default function RagflowAgentPage() {
@@ -14,7 +15,7 @@ export default function RagflowAgentPage() {
   useEffect(() => {
     const el = iframeRef.current;
     if (!el) return;
-    const { destroy } = createPenpalHostBridge({
+    const { destroy, child } = createPenpalHostBridge({
       iframe: el,
       methods: {
         navigate: (to: string) => navigate(to),
@@ -24,7 +25,11 @@ export default function RagflowAgentPage() {
         },
       },
     });
-    return () => destroy();
+    setChildPromise(child);
+    return () => {
+      clearChildPromise();
+      destroy();
+    };
   }, [navigate]);
 
   // 如需兼容旧的 postMessage 事件，可保留以下监听；为了纯 Penpal，此处移除
diff --git a/src/pages/ragflow/iframe.tsx b/src/pages/ragflow/iframe.tsx
index b4a6d56..bc05263 100644
--- a/src/pages/ragflow/iframe.tsx
+++ b/src/pages/ragflow/iframe.tsx
@@ -1,6 +1,7 @@
 import { useEffect, useRef } from 'react';
 import { useLocation, useNavigate } from 'react-router-dom';
 import { createPenpalHostBridge, toChildPath } from '@teres/iframe-bridge';
+import { setChildPromise, clearChildPromise } from '@/iframe/bridgeManager';
 
 export default function RagflowIframePage() {
   const location = useLocation();
@@ -13,7 +14,7 @@ export default function RagflowIframePage() {
   useEffect(() => {
     const el = iframeRef.current;
     if (!el) return;
-    const { destroy } = createPenpalHostBridge({
+    const { destroy, child } = createPenpalHostBridge({
       iframe: el,
       methods: {
         navigate: (to: string) => navigate(to),
@@ -23,7 +24,11 @@ export default function RagflowIframePage() {
         },
       },
     });
-    return () => destroy();
+    setChildPromise(child);
+    return () => {
+      clearChildPromise();
+      destroy();
+    };
   }, [navigate, src]);
 
   return (