diff --git a/packages/ui/src/api/client.ts b/packages/ui/src/api/client.ts
index 5a45cff..81aefdb 100644
--- a/packages/ui/src/api/client.ts
+++ b/packages/ui/src/api/client.ts
@@ -151,6 +151,8 @@ export type {
   // System Commands types
   SystemCommandInfo,
   SystemCommandListResponse,
+  // Active file types
+  ActiveFileInfo,
 } from './types.js';
 
 // API Configuration
diff --git a/packages/ui/src/api/types.ts b/packages/ui/src/api/types.ts
index 3466a30..630be79 100644
--- a/packages/ui/src/api/types.ts
+++ b/packages/ui/src/api/types.ts
@@ -1144,3 +1144,17 @@ export interface AllFilesDiagnosticsResponse {
 /** 诊断响应（联合类型） */
 export type DiagnosticsResponse = SingleFileDiagnosticsResponse | AllFilesDiagnosticsResponse;
 
+// ============ 编辑器活动文件相关 ============
+
+/** 当前编辑器活动文件信息 */
+export interface ActiveFileInfo {
+  /** 文件路径 */
+  path: string;
+  /** 文件名 */
+  name: string;
+  /** 文件内容 */
+  content: string;
+  /** 语言类型 */
+  language: string;
+}
+
diff --git a/packages/ui/src/components/ChatInput.tsx b/packages/ui/src/components/ChatInput.tsx
index c55ec0d..8d44db8 100644
--- a/packages/ui/src/components/ChatInput.tsx
+++ b/packages/ui/src/components/ChatInput.tsx
@@ -8,7 +8,7 @@
  */
 
 import { useState, useRef, useEffect, useCallback, useMemo } from 'react';
-import { Square, Sparkles } from 'lucide-react';
+import { Square, Sparkles, FileCode, Link } from 'lucide-react';
 import { motion } from 'framer-motion';
 import clsx from 'clsx';
 import { CommandMenu, type CommandMenuItem } from './CommandMenu.js';
@@ -19,6 +19,7 @@ import { AgentModeSelector, type AgentModeType } from './AgentModeSelector.js';
 import { useCommands } from '../hooks/useCommands.js';
 import { useSystemCommands } from '../hooks/useSystemCommands.js';
 import { useFileMention } from '../hooks/useFileMention.js';
+import type { ActiveFileInfo } from '../api/types.js';
 
 interface ChatInputProps {
   onSend: (content: string) => void;
@@ -39,6 +40,12 @@ interface ChatInputProps {
   autoApprove?: boolean;
   /** 自动授权变更回调 */
   onAutoApproveChange?: (enabled: boolean) => void;
+  /** 当前编辑器活动文件 */
+  activeFile?: ActiveFileInfo | null;
+  /** 是否自动附加当前编辑器文件 */
+  autoAttachActiveFile?: boolean;
+  /** 自动附加开关变更回调 */
+  onAutoAttachActiveFileToggle?: (enabled: boolean) => void;
 }
 
 export function ChatInput({
@@ -53,6 +60,9 @@ export function ChatInput({
   onAgentModeChange,
   autoApprove = false,
   onAutoApproveChange,
+  activeFile,
+  autoAttachActiveFile = true,
+  onAutoAttachActiveFileToggle,
 }: ChatInputProps) {
   const [input, setInput] = useState('');
   const [showCommandMenu, setShowCommandMenu] = useState(false);
@@ -249,7 +259,17 @@ export function ChatInput({
     setShowSystemCommandMenu(false);
     closeFileMenu();
 
-    onSend(trimmed);
+    // 构建最终消息内容
+    let messageContent = trimmed;
+
+    // 自动附加当前编辑器文件（如果启用且文件未在 @提及中）
+    // 排除 / 斜杠命令和 : 系统命令
+    const isCommand = trimmed.startsWith('/') || trimmed.startsWith(':');
+    if (!isCommand && autoAttachActiveFile && activeFile && !mentionedFiles.includes(activeFile.path)) {
+      messageContent = `@${activeFile.path} ${messageContent}`;
+    }
+
+    onSend(messageContent);
     setInput('');
 
     // 重置高度
@@ -370,9 +390,47 @@ export function ChatInput({
               : 'border-line hover:border-fg-subtle/30 focus-within:border-primary-500 focus-within:shadow-lg focus-within:shadow-primary-500/10'
           )}
         >
-          {/* 已选文件标签 */}
-          {mentionedFiles.length > 0 && (
-            <div className="flex flex-wrap gap-1.5 px-4 pt-3">
+          {/* 文件标签区域：活动文件 + 已选文件 */}
+          {(activeFile || mentionedFiles.length > 0) && (
+            <div className="flex flex-wrap items-center gap-1.5 px-4 pt-3">
+              {/* 当前编辑器活动文件 */}
+              {activeFile && !mentionedFiles.includes(activeFile.path) && (
+                <div className="flex items-center gap-1">
+                  {/* 自动附加开关 */}
+                  {onAutoAttachActiveFileToggle && (
+                    <button
+                      type="button"
+                      onClick={() => onAutoAttachActiveFileToggle(!autoAttachActiveFile)}
+                      className={clsx(
+                        'p-1 rounded transition-colors',
+                        autoAttachActiveFile
+                          ? 'text-cyan-500 hover:text-cyan-400'
+                          : 'text-fg-subtle hover:text-fg-muted'
+                      )}
+                      title={autoAttachActiveFile ? '点击取消自动附加' : '点击启用自动附加'}
+                    >
+                      <Link size={14} />
+                    </button>
+                  )}
+                  {/* 活动文件标签 */}
+                  <div
+                    className={clsx(
+                      'inline-flex items-center gap-1.5 px-2 py-1 rounded-md text-xs transition-colors',
+                      autoAttachActiveFile
+                        ? 'bg-cyan-500/15 text-cyan-400 border border-cyan-500/30'
+                        : 'bg-surface-muted text-fg-muted border border-transparent'
+                    )}
+                    title={autoAttachActiveFile ? `当前文件: ${activeFile.path}（将自动附加）` : `当前文件: ${activeFile.path}（不会附加）`}
+                  >
+                    <FileCode size={12} />
+                    <span className="max-w-[120px] truncate">{activeFile.name}</span>
+                    {autoAttachActiveFile && (
+                      <span className="text-[10px] opacity-70">(auto)</span>
+                    )}
+                  </div>
+                </div>
+              )}
+              {/* @提及的文件 */}
               {mentionedFiles.map((file, index) => (
                 <FileMentionTag
                   key={`${file}-${index}`}
diff --git a/packages/ui/src/components/IDE.tsx b/packages/ui/src/components/IDE.tsx
index 9bba172..5ca40de 100644
--- a/packages/ui/src/components/IDE.tsx
+++ b/packages/ui/src/components/IDE.tsx
@@ -10,6 +10,7 @@ import { cn } from '../utils/cn.js';
 import { readFile, getWorkingDirectory } from '../api/client.js';
 import { FileExplorer } from './FileExplorer.js';
 import { CodeEditor, getLanguageFromFilename, type EditorTab } from './CodeEditor.js';
+import type { ActiveFileInfo } from '../api/types.js';
 
 // localStorage 键名
 const STORAGE_KEY_TABS = 'ai-assistant-editor-tabs';
@@ -25,9 +26,11 @@ interface IDEProps {
   className?: string;
   /** 文件浏览器宽度 */
   sidebarWidth?: number;
+  /** 当前活动文件变化回调 */
+  onActiveFileChange?: (file: ActiveFileInfo | null) => void;
 }
 
-export function IDE({ className, sidebarWidth = 256 }: IDEProps) {
+export function IDE({ className, sidebarWidth = 256, onActiveFileChange }: IDEProps) {
   const [tabs, setTabs] = useState<EditorTab[]>([]);
   const [activeTabId, setActiveTabId] = useState<string | null>(null);
   const [workingDirectory, setWorkingDirectory] = useState<string>('');
@@ -134,6 +137,23 @@ export function IDE({ className, sidebarWidth = 256 }: IDEProps) {
     }
   }, [activeTabId, tabs]);
 
+  // 通知父组件活动文件变化
+  useEffect(() => {
+    if (!onActiveFileChange) return;
+
+    const activeTab = tabs.find((tab) => tab.id === activeTabId);
+    if (activeTab) {
+      onActiveFileChange({
+        path: activeTab.path,
+        name: activeTab.name,
+        content: activeTab.content,
+        language: activeTab.language,
+      });
+    } else {
+      onActiveFileChange(null);
+    }
+  }, [activeTabId, tabs, onActiveFileChange]);
+
   // 打开文件
   const handleFileSelect = useCallback(async (path: string, name: string) => {
     // 检查是否已打开
diff --git a/packages/ui/src/index.ts b/packages/ui/src/index.ts
index 4164fc3..210968b 100644
--- a/packages/ui/src/index.ts
+++ b/packages/ui/src/index.ts
@@ -199,6 +199,8 @@ export type {
   SingleFileDiagnosticsResponse,
   AllFilesDiagnosticsResponse,
   DiagnosticsResponse,
+  // Active file types
+  ActiveFileInfo,
 } from './api/client.js';
 
 // Primitives (shadcn/ui style)
diff --git a/packages/web/src/App.tsx b/packages/web/src/App.tsx
index a5b09c3..b1a269d 100644
--- a/packages/web/src/App.tsx
+++ b/packages/web/src/App.tsx
@@ -23,6 +23,7 @@ import {
   listSessions,
   createSession,
   type Session,
+  type ActiveFileInfo,
 } from '@ai-assistant/ui';
 import { ChatPage } from './pages/Chat';
 
@@ -45,6 +46,18 @@ export function App() {
     return saved ? parseFloat(saved) : 70;
   });
 
+  // 编辑器联动状态
+  const [activeFile, setActiveFile] = useState<ActiveFileInfo | null>(null);
+  const [autoAttachActiveFile, setAutoAttachActiveFile] = useState(() => {
+    const saved = localStorage.getItem('ai-assistant-auto-attach-file');
+    return saved !== 'false'; // 默认开启
+  });
+
+  // 持久化自动附加开关状态
+  useEffect(() => {
+    localStorage.setItem('ai-assistant-auto-attach-file', String(autoAttachActiveFile));
+  }, [autoAttachActiveFile]);
+
   // 初始化：加载会话
   useEffect(() => {
     const HAS_SESSIONS_KEY = 'ai-assistant-has-sessions';
@@ -146,7 +159,7 @@ export function App() {
             className="hidden md:flex flex-col"
             style={{ width: `${idePanelWidth}%` }}
           >
-            <IDE />
+            <IDE onActiveFileChange={setActiveFile} />
           </div>
 
           {/* 可拖拽分割线 */}
@@ -175,6 +188,9 @@ export function App() {
                 onOpenLSP={() => setShowLSP(true)}
                 onOpenDiagnostics={() => setShowDiagnostics(true)}
                 onOpenSessions={() => setShowSessions(true)}
+                activeFile={activeFile}
+                autoAttachActiveFile={autoAttachActiveFile}
+                onAutoAttachActiveFileToggle={setAutoAttachActiveFile}
               />
             ) : (
               <div className="flex-1 flex items-center justify-center h-full">
diff --git a/packages/web/src/pages/Chat.tsx b/packages/web/src/pages/Chat.tsx
index 06b7fa2..30dfaea 100644
--- a/packages/web/src/pages/Chat.tsx
+++ b/packages/web/src/pages/Chat.tsx
@@ -16,6 +16,7 @@ import {
   SubagentProgress,
   DiagnosticsIndicator,
   ToolbarOverflowMenu,
+  type ActiveFileInfo,
 } from '@ai-assistant/ui';
 
 interface ChatPageProps {
@@ -35,6 +36,13 @@ interface ChatPageProps {
   onOpenLSP?: () => void;
   onOpenDiagnostics?: () => void;
   onOpenSessions?: () => void;
+  // 编辑器联动
+  /** 当前编辑器活动文件 */
+  activeFile?: ActiveFileInfo | null;
+  /** 是否自动附加当前编辑器文件 */
+  autoAttachActiveFile?: boolean;
+  /** 自动附加开关变更回调 */
+  onAutoAttachActiveFileToggle?: (enabled: boolean) => void;
 }
 
 export function ChatPage({
@@ -52,6 +60,9 @@ export function ChatPage({
   onOpenLSP,
   onOpenDiagnostics,
   onOpenSessions,
+  activeFile,
+  autoAttachActiveFile,
+  onAutoAttachActiveFileToggle,
 }: ChatPageProps) {
   const {
     messages,
@@ -228,6 +239,9 @@ export function ChatPage({
         onAgentModeChange={setAgentMode}
         autoApprove={autoApprove}
         onAutoApproveChange={setAutoApprove}
+        activeFile={activeFile}
+        autoAttachActiveFile={autoAttachActiveFile}
+        onAutoAttachActiveFileToggle={onAutoAttachActiveFileToggle}
       />
 
       {/* Permission Dialog */}