diff --git a/src/config/settings.ts b/src/config/settings.ts
index 769cece..4c0e9f1 100644
--- a/src/config/settings.ts
+++ b/src/config/settings.ts
@@ -10,6 +10,9 @@ type Environment = "dev" | "test" | "prod";
 /** 当前环境 - 修改这里切换环境 */
 const CURRENT_ENV: Environment = "dev";
 
+/** 服务等级类型 */
+export type ServiceTier = 'lite' | 'syntaxic' | 'max' | 'auto';
+
 /** 配置项接口 */
 export interface IccoderConfig {
   /** 后端服务地址 */
@@ -18,6 +21,8 @@ export interface IccoderConfig {
   timeout: number;
   /** 用户ID（临时使用，后续对接认证） */
   userId: string;
+  /** 服务等级 */
+  serviceTier: ServiceTier;
 }
 
 /** 环境配置 */
@@ -25,20 +30,23 @@ const ENV_CONFIG: Record<Environment, IccoderConfig> = {
   /** 本地开发环境 */
   dev: {
     backendUrl: "http://localhost:2233",
-    timeout: 300000,  // 5分钟，与子智能体超时一致
+    timeout: 300000,
     userId: "default-user",
+    serviceTier: "max",  // 默认使用 max
   },
   /** 测试服务器环境 */
   test: {
     backendUrl: "http://192.168.1.108:2233",
     timeout: 60000,
     userId: "default-user",
+    serviceTier: "max",
   },
   /** 生产环境 */
   prod: {
-    backendUrl: "https://api.iccoder.com", // TODO: 替换为实际生产地址
+    backendUrl: "https://api.iccoder.com",
     timeout: 60000,
     userId: "default-user",
+    serviceTier: "auto",
   },
 };
 
diff --git a/src/panels/ICHelperPanel.ts b/src/panels/ICHelperPanel.ts
index 0a45b08..8f2ab5f 100644
--- a/src/panels/ICHelperPanel.ts
+++ b/src/panels/ICHelperPanel.ts
@@ -148,7 +148,8 @@ export async function showICHelperPanel(
             panel,
             message.text,
             context.extensionPath,
-            message.mode
+            message.mode,
+            message.model  // 传递服务等级
           );
           break;
         case "readFile":
diff --git a/src/services/dialogService.ts b/src/services/dialogService.ts
index 3f6b6ca..c819840 100644
--- a/src/services/dialogService.ts
+++ b/src/services/dialogService.ts
@@ -9,7 +9,7 @@ import { startStreamDialog, generateTaskId, SSEController, SSECallbacks } from '
 import { executeToolCall, createToolExecutorContext, ToolExecutorContext } from './toolExecutor';
 import { userInteractionManager } from './userInteraction';
 import { getConfig } from '../config/settings';
-import type { DialogRequest, ToolCallRequest, AskUserEvent, RunMode, ToolConfirmEvent, PlanConfirmEvent } from '../types/api';
+import type { DialogRequest, ToolCallRequest, AskUserEvent, RunMode, ServiceTier, ToolConfirmEvent, PlanConfirmEvent } from '../types/api';
 import { submitToolConfirm, submitAnswer, stopDialog } from './apiClient';
 import { ChatHistoryManager } from '../utils/chatHistoryManager';
 
@@ -316,7 +316,8 @@ export class DialogSession {
   async sendMessage(
     message: string,
     callbacks: DialogCallbacks,
-    mode?: RunMode
+    mode?: RunMode,
+    serviceTier?: ServiceTier  // 新增：服务等级参数
   ): Promise<void> {
     if (this.isActive) {
       callbacks.onError?.('当前有对话正在进行中');
@@ -344,6 +345,7 @@ export class DialogSession {
       message,
       userId: config.userId,
       mode: mode || 'agent',
+      serviceTier: serviceTier || config.serviceTier,  // 优先使用传入的参数
       compactedData: compactedData || undefined,
       newMessages: newMessages.length > 0 ? newMessages : undefined,
       knowledgeData: knowledgeData || undefined
diff --git a/src/types/api.ts b/src/types/api.ts
index d9b0a71..e1b6e96 100644
--- a/src/types/api.ts
+++ b/src/types/api.ts
@@ -16,6 +16,15 @@ import { CompactedMemory, CompactedMessage } from './memory';
  */
 export type RunMode = 'plan' | 'ask' | 'agent' | 'auto';
 
+/**
+ * 服务等级类型
+ * - lite: 轻量级
+ * - syntaxic: 语法级
+ * - max: 最大性能
+ * - auto: 自动选择
+ */
+export type ServiceTier = 'lite' | 'syntaxic' | 'max' | 'auto';
+
 /**
  * 对话请求
  * POST /api/dialog/stream
@@ -29,6 +38,8 @@ export interface DialogRequest {
   userId: string;
   /** 运行模式 */
   mode: RunMode;
+  /** 服务等级 */
+  serviceTier?: ServiceTier;
   /** 压缩后的记忆数据（用于后端重启后恢复） */
   compactedData?: CompactedMemory;
   /** 压缩后产生的新消息 */
@@ -59,7 +70,8 @@ export type SSEEventType =
   | 'error'           // 错误
   | 'warning'         // 警告
   | 'notification'    // 通知
-  | 'depth_update';   // 深度更新
+  | 'depth_update'    // 深度更新
+  | 'heartbeat';      // 心跳
 
 /** text_delta 事件数据 */
 export interface TextDeltaEvent {
diff --git a/src/utils/messageHandler.ts b/src/utils/messageHandler.ts
index 3ea034d..872e043 100644
--- a/src/utils/messageHandler.ts
+++ b/src/utils/messageHandler.ts
@@ -19,7 +19,7 @@ import { dialogManager, DialogSession } from "../services/dialogService";
 import { userInteractionManager } from "../services/userInteraction";
 import { healthCheck } from "../services/apiClient";
 
-import type { RunMode } from "../types/api";
+import type { RunMode, ServiceTier } from "../types/api";
 
 /** 是否使用后端服务（可通过配置控制） */
 let useBackendService = true;
@@ -58,7 +58,8 @@ export async function handleUserMessage(
   panel: vscode.WebviewPanel,
   text: string,
   extensionPath?: string,
-  mode?: RunMode
+  mode?: RunMode,
+  serviceTier?: ServiceTier  // 新增：服务等级参数
 ) {
   console.log("收到用户消息:", text);
 
@@ -90,7 +91,7 @@ export async function handleUserMessage(
   // 尝试使用后端服务
   if (useBackendService && extensionPath) {
     try {
-      await handleUserMessageWithBackend(panel, text, extensionPath, mode);
+      await handleUserMessageWithBackend(panel, text, extensionPath, mode, undefined, serviceTier);
       return;
     } catch (error) {
       console.error("后端服务不可用:", error);
@@ -125,7 +126,8 @@ async function handleUserMessageWithBackend(
   text: string,
   extensionPath: string,
   mode?: RunMode,
-  reuseTaskId?: string // 可选，复用现有 taskId（用于 Plan 模式确认后继续执行）
+  reuseTaskId?: string, // 可选，复用现有 taskId（用于 Plan 模式确认后继续执行）
+  serviceTier?: ServiceTier  // 新增：服务等级参数
 ): Promise<void> {
   const historyManager = ChatHistoryManager.getInstance();
 
@@ -287,7 +289,8 @@ async function handleUserMessageWithBackend(
           });
         },
       },
-      mode
+      mode,
+      serviceTier  // 传递服务等级
     );
   });
 }