diff --git a/server/adapters/glm_adapter.py b/server/adapters/glm_adapter.py
index f7e6897..d13533a 100644
--- a/server/adapters/glm_adapter.py
+++ b/server/adapters/glm_adapter.py
@@ -138,6 +138,11 @@ class GLMAdapter(BaseAdapter):
             logger.info(
                 f"[GLM] 深度思考已启用: extra_kwargs['thinking'] = {extra_kwargs['thinking']}"
             )
+        else:
+            extra_kwargs["thinking"] = {"type": "disabled"}
+            logger.info(
+                f"[GLM] 深度思考已禁用: extra_kwargs['thinking'] = {extra_kwargs['thinking']}"
+            )
 
         if extra_kwargs:
             logger.info(
diff --git a/server/api/conversation_routes.py b/server/api/conversation_routes.py
index ee4971c..c087f5d 100644
--- a/server/api/conversation_routes.py
+++ b/server/api/conversation_routes.py
@@ -74,6 +74,44 @@ async def delete_conversation_handler(conversation_id: str):
         raise HTTPException(status_code=404, detail="对话不存在")
 
 
+async def update_conversation_handler(conversation_id: str, data: dict):
+    """部分更新对话处理器"""
+    db = get_db()
+    result = db.update_conversation(conversation_id, data)
+    if result:
+        return result
+    else:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+
+# ── 消息管理 ─────────────────────────────────────────────────────
+
+
+async def add_message_handler(conversation_id: str, message: dict):
+    """添加消息到对话处理器"""
+    db = get_db()
+    # 检查对话是否存在
+    existing = db.get_conversation(conversation_id)
+    if not existing:
+        raise HTTPException(status_code=404, detail="对话不存在")
+    return db.add_message(conversation_id, message)
+
+
+async def update_message_handler(conversation_id: str, message_id: str, data: dict):
+    """更新消息处理器"""
+    db = get_db()
+    # 检查对话是否存在
+    existing = db.get_conversation(conversation_id)
+    if not existing:
+        raise HTTPException(status_code=404, detail="对话不存在")
+
+    result = db.update_message(message_id, data)
+    if result:
+        return result
+    else:
+        raise HTTPException(status_code=404, detail="消息不存在")
+
+
 # ── 文件上传 ─────────────────────────────────────────────────────
 
 
diff --git a/server/database/db.py b/server/database/db.py
index 3886e77..7915ae1 100644
--- a/server/database/db.py
+++ b/server/database/db.py
@@ -76,6 +76,38 @@ class Database:
             CREATE INDEX IF NOT EXISTS idx_messages_conversation
             ON messages(conversation_id)
         """)
+
+        # 检查并添加缺失的列（迁移旧数据库 - conversations 表）
+        cursor.execute("PRAGMA table_info(conversations)")
+        conv_columns = [col[1] for col in cursor.fetchall()]
+
+        conv_migrations = [
+            ('user_id', "TEXT DEFAULT 'default'"),
+            ('pinned', "INTEGER DEFAULT 0"),
+            ('archived', "INTEGER DEFAULT 0"),
+            ('settings', "TEXT"),
+        ]
+
+        for col_name, col_def in conv_migrations:
+            if col_name not in conv_columns:
+                cursor.execute(f"ALTER TABLE conversations ADD COLUMN {col_name} {col_def}")
+                print(f"[数据库] conversations 表已添加 {col_name} 列")
+
+        # 检查并添加缺失的列（迁移旧数据库 - messages 表）
+        cursor.execute("PRAGMA table_info(messages)")
+        msg_columns = [col[1] for col in cursor.fetchall()]
+
+        msg_migrations = [
+            ('timestamp', "INTEGER"),
+            ('feedback', "TEXT"),
+        ]
+
+        for col_name, col_def in msg_migrations:
+            if col_name not in msg_columns:
+                cursor.execute(f"ALTER TABLE messages ADD COLUMN {col_name} {col_def}")
+                print(f"[数据库] messages 表已添加 {col_name} 列")
+
+        # 创建 user_id 索引（在确保列存在后）
         cursor.execute("""
             CREATE INDEX IF NOT EXISTS idx_conversations_user
             ON conversations(user_id)
diff --git a/server/main.py b/server/main.py
index a5ff1b3..9f1919e 100644
--- a/server/main.py
+++ b/server/main.py
@@ -54,12 +54,15 @@ init_db()
 load_dotenv()
 
 # ── 会话管理路由处理器 ────────────────────────────────────────────────
-from api.conversation_routes import (delete_conversation_handler,
+from api.conversation_routes import (add_message_handler,
+                                     delete_conversation_handler,
                                      get_conversation_handler,
                                      get_conversations_handler,
                                      save_conversation_handler,
                                      serve_upload_handler,
                                      stop_generation_handler,
+                                     update_conversation_handler,
+                                     update_message_handler,
                                      upload_file_handler)
 
 # ── OpenAI 兼容网关初始化 ───────────────────────────────────────────────
@@ -189,6 +192,21 @@ async def delete_conversation(conversation_id: str):
     return await delete_conversation_handler(conversation_id)
 
 
+@app.put("/api/chat-ui/conversations/{conversation_id}")
+async def update_conversation(conversation_id: str, request: Request):
+    return await update_conversation_handler(conversation_id, await request.json())
+
+
+@app.post("/api/chat-ui/conversations/{conversation_id}/messages")
+async def add_message(conversation_id: str, request: Request):
+    return await add_message_handler(conversation_id, await request.json())
+
+
+@app.put("/api/chat-ui/conversations/{conversation_id}/messages/{message_id}")
+async def update_message(conversation_id: str, message_id: str, request: Request):
+    return await update_message_handler(conversation_id, message_id, await request.json())
+
+
 @app.post("/api/chat-ui/upload")
 async def upload_file(file: UploadFile = File(...)):
     return await upload_file_handler(file=file)
diff --git a/server/middleware/auth.py b/server/middleware/auth.py
new file mode 100644
index 0000000..190bdda
--- /dev/null
+++ b/server/middleware/auth.py
@@ -0,0 +1,45 @@
+"""
+认证中间件 - 预留接口
+
+当前返回默认用户，未来可集成 JWT、OAuth 等认证系统。
+"""
+
+from typing import Optional
+
+
+def get_current_user_id(request) -> str:
+    """
+    从请求中获取当前用户 ID（预留）
+
+    当前返回默认用户 'default'
+    未来可集成 JWT、OAuth 等
+
+    Args:
+        request: FastAPI Request 对象
+
+    Returns:
+        用户 ID 字符串
+    """
+    # TODO: 实现 token 验证逻辑
+    # 示例：
+    # auth_header = request.headers.get("Authorization")
+    # if auth_header and auth_header.startswith("Bearer "):
+    #     token = auth_header[7:]
+    #     user_id = verify_token(token)
+    #     return user_id
+
+    return "default"
+
+
+def get_current_user(request) -> dict:
+    """
+    获取当前用户完整信息（预留）
+
+    Returns:
+        用户信息字典
+    """
+    return {
+        "id": get_current_user_id(request),
+        "name": None,
+        "email": None
+    }
\ No newline at end of file
diff --git a/src/App.vue b/src/App.vue
index c33840c..0e7f799 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -126,10 +126,10 @@ useKeyboard(
 
 // 初始化
 onMounted(() => {
-  // 如果没有对话，创建一个
-  if (chatStore.conversations.length === 0) {
-    chatStore.createConversation();
-  }
+  // // 如果没有对话，创建一个
+  // if (chatStore.conversations.length === 0) {
+  //   chatStore.createConversation();
+  // }
 });
 
 // 暴露给全局使用
diff --git a/src/components/chat/ChatMain.vue b/src/components/chat/ChatMain.vue
index 8d6f5f7..1bb55ab 100644
--- a/src/components/chat/ChatMain.vue
+++ b/src/components/chat/ChatMain.vue
@@ -212,7 +212,7 @@ async function handleSend(
     .map((m: any) => ({ role: m.role, content: m.content.text }));
 
   // 添加用户消息
-  chatStore.addMessage(MessageRole.USER, {
+  await chatStore.addMessage(MessageRole.USER, {
     type: MessageType.TEXT,
     text,
     images: attachments.filter((a) => a.type === "image"),
@@ -220,7 +220,7 @@ async function handleSend(
   });
 
   // 添加 AI 消息占位符
-  const aiMessage = chatStore.addMessage(MessageRole.ASSISTANT, {
+  const aiMessage = await chatStore.addMessage(MessageRole.ASSISTANT, {
     type: MessageType.TEXT,
     text: "",
   });
diff --git a/src/services/authService.ts b/src/services/authService.ts
new file mode 100644
index 0000000..dcc6518
--- /dev/null
+++ b/src/services/authService.ts
@@ -0,0 +1,64 @@
+/**
+ * 认证服务模块 - 预留接口
+ *
+ * 当前返回默认用户，未来可集成 JWT、OAuth 等认证系统
+ */
+
+export interface AuthUser {
+  id: string;
+  name?: string;
+  email?: string;
+}
+
+// Token 存储 key
+const AUTH_TOKEN_KEY = 'auth_token';
+
+export const authService = {
+  /**
+   * 获取当前用户（预留，目前返回默认用户）
+   */
+  getCurrentUser(): AuthUser | null {
+    // TODO: 从 token 解析用户信息
+    return { id: 'default' };
+  },
+
+  /**
+   * 获取认证 token（预留）
+   */
+  getToken(): string | null {
+    return localStorage.getItem(AUTH_TOKEN_KEY);
+  },
+
+  /**
+   * 设置 token（预留）
+   */
+  setToken(token: string): void {
+    localStorage.setItem(AUTH_TOKEN_KEY, token);
+  },
+
+  /**
+   * 清除认证信息（预留）
+   */
+  clearAuth(): void {
+    localStorage.removeItem(AUTH_TOKEN_KEY);
+  },
+
+  /**
+   * 检查是否已认证（预留，目前始终返回 true）
+   */
+  isAuthenticated(): boolean {
+    // TODO: 实现真实的认证检查
+    return true;
+  },
+
+  /**
+   * 获取 Authorization header 值
+   */
+  getAuthHeader(): Record<string, string> {
+    const token = this.getToken();
+    if (token) {
+      return { Authorization: `Bearer ${token}` };
+    }
+    return {};
+  }
+};
\ No newline at end of file
diff --git a/src/services/conversationApi.ts b/src/services/conversationApi.ts
new file mode 100644
index 0000000..7efe611
--- /dev/null
+++ b/src/services/conversationApi.ts
@@ -0,0 +1,294 @@
+/**
+ * 对话 API 服务层
+ *
+ * 封装所有对话相关的后端 API 调用，支持认证预留
+ */
+
+import { authService } from './authService';
+import type { Conversation, Message, MessageContent, ConversationSettings } from '@/types/chat';
+
+// API 端点
+const API_BASE = '/api/chat-ui';
+const ENDPOINTS = {
+  CONVERSATIONS: `${API_BASE}/conversations`,
+  CONVERSATION: (id: string) => `${API_BASE}/conversations/${id}`,
+  CONVERSATION_MESSAGES: (id: string) => `${API_BASE}/conversations/${id}/messages`,
+};
+
+// 后端返回的对话数据格式
+interface BackendConversation {
+  id: string;
+  userId?: string;
+  title: string;
+  createdAt: number;
+  updatedAt: number;
+  pinned: boolean;
+  archived: boolean;
+  settings?: ConversationSettings;
+  messages?: BackendMessage[];
+}
+
+// 后端返回的消息数据格式
+interface BackendMessage {
+  id: string;
+  role: string;
+  content: MessageContent;
+  timestamp: number;
+  feedback?: {
+    liked?: boolean;
+    disliked?: boolean;
+    copied?: boolean;
+  };
+}
+
+/**
+ * 获取请求头（包含认证信息）
+ */
+function getHeaders(): Record<string, string> {
+  const headers: Record<string, string> = {
+    'Content-Type': 'application/json',
+  };
+  // 添加认证 header（预留）
+  const authHeader = authService.getAuthHeader();
+  return { ...headers, ...authHeader };
+}
+
+/**
+ * 将后端对话格式转换为前端格式
+ */
+function transformConversation(backendConv: BackendConversation): Conversation {
+  return {
+    id: backendConv.id,
+    title: backendConv.title,
+    createdAt: backendConv.createdAt,
+    updatedAt: backendConv.updatedAt,
+    pinned: backendConv.pinned,
+    archived: backendConv.archived,
+    settings: backendConv.settings,
+    messages: (backendConv.messages || []).map(transformMessage),
+  };
+}
+
+/**
+ * 将后端消息格式转换为前端格式
+ */
+function transformMessage(backendMsg: BackendMessage): Message {
+  return {
+    id: backendMsg.id,
+    role: backendMsg.role as 'user' | 'assistant' | 'system',
+    content: backendMsg.content,
+    timestamp: backendMsg.timestamp,
+    feedback: backendMsg.feedback,
+    isStreaming: false,
+  } as Message;
+}
+
+/**
+ * 将前端对话格式转换为后端格式
+ */
+function toBackendFormat(conversation: Partial<Conversation>): Record<string, unknown> {
+  const data: Record<string, unknown> = {};
+
+  if (conversation.id !== undefined) data.id = conversation.id;
+  if (conversation.title !== undefined) data.title = conversation.title;
+  if (conversation.createdAt !== undefined) data.createdAt = conversation.createdAt;
+  if (conversation.updatedAt !== undefined) data.updatedAt = conversation.updatedAt;
+  if (conversation.pinned !== undefined) data.pinned = conversation.pinned;
+  if (conversation.archived !== undefined) data.archived = conversation.archived;
+  if (conversation.settings !== undefined) data.settings = conversation.settings;
+  if (conversation.messages !== undefined) {
+    data.messages = conversation.messages.map(msg => ({
+      id: msg.id,
+      role: msg.role,
+      content: msg.content,
+      timestamp: msg.timestamp,
+      feedback: msg.feedback,
+    }));
+  }
+
+  return data;
+}
+
+/**
+ * 对话 API 服务
+ */
+export const conversationApi = {
+  /**
+   * 获取所有对话列表（不含消息内容）
+   */
+  async fetchConversations(): Promise<Conversation[]> {
+    const response = await fetch(ENDPOINTS.CONVERSATIONS, {
+      method: 'GET',
+      headers: getHeaders(),
+    });
+
+    if (!response.ok) {
+      throw new Error(`获取对话列表失败: HTTP ${response.status}`);
+    }
+
+    const data: BackendConversation[] = await response.json();
+    return data.map(transformConversation);
+  },
+
+  /**
+   * 获取单个对话（含消息内容）
+   */
+  async fetchConversation(id: string): Promise<Conversation> {
+    const response = await fetch(ENDPOINTS.CONVERSATION(id), {
+      method: 'GET',
+      headers: getHeaders(),
+    });
+
+    if (!response.ok) {
+      if (response.status === 404) {
+        throw new Error('对话不存在');
+      }
+      throw new Error(`获取对话失败: HTTP ${response.status}`);
+    }
+
+    const data: BackendConversation = await response.json();
+    return transformConversation(data);
+  },
+
+  /**
+   * 创建新对话
+   */
+  async createConversation(data: Partial<Conversation>): Promise<Conversation> {
+    const response = await fetch(ENDPOINTS.CONVERSATIONS, {
+      method: 'POST',
+      headers: getHeaders(),
+      body: JSON.stringify(toBackendFormat(data)),
+    });
+
+    if (!response.ok) {
+      throw new Error(`创建对话失败: HTTP ${response.status}`);
+    }
+
+    const result: BackendConversation = await response.json();
+    return transformConversation(result);
+  },
+
+  /**
+   * 更新对话（部分更新）
+   */
+  async updateConversation(id: string, data: Partial<Conversation>): Promise<Conversation> {
+    const response = await fetch(ENDPOINTS.CONVERSATION(id), {
+      method: 'PUT',
+      headers: getHeaders(),
+      body: JSON.stringify(toBackendFormat(data)),
+    });
+
+    if (!response.ok) {
+      if (response.status === 404) {
+        throw new Error('对话不存在');
+      }
+      throw new Error(`更新对话失败: HTTP ${response.status}`);
+    }
+
+    const result: BackendConversation = await response.json();
+    return transformConversation(result);
+  },
+
+  /**
+   * 保存对话（创建或更新）
+   */
+  async saveConversation(conversation: Conversation): Promise<Conversation> {
+    const data = toBackendFormat(conversation);
+
+    const response = await fetch(ENDPOINTS.CONVERSATIONS, {
+      method: 'POST',
+      headers: getHeaders(),
+      body: JSON.stringify(data),
+    });
+
+    if (!response.ok) {
+      throw new Error(`保存对话失败: HTTP ${response.status}`);
+    }
+
+    const result: BackendConversation = await response.json();
+    return transformConversation(result);
+  },
+
+  /**
+   * 删除对话
+   */
+  async deleteConversation(id: string): Promise<void> {
+    const response = await fetch(ENDPOINTS.CONVERSATION(id), {
+      method: 'DELETE',
+      headers: getHeaders(),
+    });
+
+    if (!response.ok) {
+      if (response.status === 404) {
+        // 对话已不存在，视为成功
+        return;
+      }
+      throw new Error(`删除对话失败: HTTP ${response.status}`);
+    }
+  },
+
+  /**
+   * 添加消息到对话（增量更新）
+   */
+  async addMessage(conversationId: string, message: Partial<Message>): Promise<Message> {
+    const response = await fetch(ENDPOINTS.CONVERSATION_MESSAGES(conversationId), {
+      method: 'POST',
+      headers: getHeaders(),
+      body: JSON.stringify({
+        id: message.id,
+        role: message.role,
+        content: message.content,
+        timestamp: message.timestamp,
+        feedback: message.feedback,
+      }),
+    });
+
+    if (!response.ok) {
+      throw new Error(`添加消息失败: HTTP ${response.status}`);
+    }
+
+    const result: BackendMessage = await response.json();
+    return transformMessage(result);
+  },
+
+  /**
+   * 更新消息
+   */
+  async updateMessage(conversationId: string, messageId: string, data: Partial<Message>): Promise<Message> {
+    const response = await fetch(`${ENDPOINTS.CONVERSATION(conversationId)}/messages/${messageId}`, {
+      method: 'PUT',
+      headers: getHeaders(),
+      body: JSON.stringify({
+        content: data.content,
+        feedback: data.feedback,
+      }),
+    });
+
+    if (!response.ok) {
+      throw new Error(`更新消息失败: HTTP ${response.status}`);
+    }
+
+    const result: BackendMessage = await response.json();
+    return transformMessage(result);
+  },
+
+  /**
+   * 批量迁移对话数据
+   */
+  async migrateConversations(conversations: Conversation[]): Promise<{ success: number; failed: number }> {
+    let success = 0;
+    let failed = 0;
+
+    for (const conversation of conversations) {
+      try {
+        await this.saveConversation(conversation);
+        success++;
+      } catch (e) {
+        console.error(`迁移对话失败 [${conversation.id}]:`, e);
+        failed++;
+      }
+    }
+
+    return { success, failed };
+  },
+};
\ No newline at end of file
diff --git a/src/stores/chat.ts b/src/stores/chat.ts
index 598d45a..c189be1 100644
--- a/src/stores/chat.ts
+++ b/src/stores/chat.ts
@@ -8,6 +8,7 @@ import type {
 } from "@/types/chat";
 import { MessageRole } from "@/types/chat";
 import { generateId, extractTitleFromMessage } from "@/utils/helpers";
+import { conversationApi } from "@/services/conversationApi";
 
 export const useChatStore = defineStore("chat", () => {
   // 状态
@@ -15,6 +16,8 @@ export const useChatStore = defineStore("chat", () => {
   const currentConversationId = ref<string | null>(null);
   const isStreaming = ref(false);
   const streamController = ref<AbortController | null>(null);
+  const isInitialized = ref(false);
+  const isLoading = ref(false);
 
   // 计算属性
   const currentConversation = computed(() => {
@@ -40,8 +43,43 @@ export const useChatStore = defineStore("chat", () => {
     return sortedConversations.value.filter((c) => !c.pinned && !c.archived);
   });
 
-  // 方法
-  function createConversation(): string {
+  // 初始化方法 - 从后端 API 加载数据
+  async function initializeFromApi() {
+    if (isInitialized.value || isLoading.value) return;
+
+    isLoading.value = true;
+    try {
+      const loadedConversations = await conversationApi.fetchConversations();
+      conversations.value = loadedConversations;
+
+      // 恢复当前对话 ID（从 localStorage 或选择第一个）
+      const storedId = localStorage.getItem("chat-current-id");
+      if (storedId && conversations.value.find((c) => c.id === storedId)) {
+        currentConversationId.value = storedId;
+      } else if (conversations.value.length > 0) {
+        currentConversationId.value = conversations.value[0].id;
+      }
+
+      isInitialized.value = true;
+    } catch (error) {
+      console.error("Failed to initialize from API:", error);
+      // 如果 API 失败，尝试从 localStorage 加载（降级处理）
+      loadFromStorage();
+    } finally {
+      isLoading.value = false;
+    }
+  }
+
+  // 保存当前对话 ID 到 localStorage
+  function saveCurrentId() {
+    localStorage.setItem(
+      "chat-current-id",
+      currentConversationId.value || ""
+    );
+  }
+
+  // 创建对话
+  async function createConversation(): Promise<string> {
     const newConversation: Conversation = {
       id: generateId(),
       title: "新对话",
@@ -53,89 +91,171 @@ export const useChatStore = defineStore("chat", () => {
       settings: undefined,
     };
 
+    // 乐观更新
     conversations.value.unshift(newConversation);
     currentConversationId.value = newConversation.id;
-    saveToStorage();
+    saveCurrentId();
+
+    // 异步保存到后端
+    try {
+      const saved = await conversationApi.createConversation(newConversation);
+      // 更新本地数据（以防后端修改了某些字段）
+      const index = conversations.value.findIndex((c) => c.id === newConversation.id);
+      if (index !== -1) {
+        conversations.value[index] = saved;
+      }
+    } catch (error) {
+      console.error("Failed to create conversation:", error);
+      // 回滚乐观更新
+      const index = conversations.value.findIndex((c) => c.id === newConversation.id);
+      if (index !== -1) {
+        conversations.value.splice(index, 1);
+      }
+      throw error;
+    }
 
     return newConversation.id;
   }
 
-  function deleteConversation(id: string) {
+  // 删除对话
+  async function deleteConversation(id: string) {
     const index = conversations.value.findIndex((c) => c.id === id);
-    if (index !== -1) {
-      conversations.value.splice(index, 1);
+    if (index === -1) return;
 
-      if (currentConversationId.value === id) {
-        currentConversationId.value = conversations.value[0]?.id || null;
-      }
+    // 保存引用以便回滚
+    const deletedConversation = conversations.value[index];
 
-      saveToStorage();
+    // 乐观更新
+    conversations.value.splice(index, 1);
+    if (currentConversationId.value === id) {
+      currentConversationId.value = conversations.value[0]?.id || null;
+      saveCurrentId();
+    }
+
+    // 异步删除
+    try {
+      await conversationApi.deleteConversation(id);
+    } catch (error) {
+      console.error("Failed to delete conversation:", error);
+      // 回滚
+      conversations.value.splice(index, 0, deletedConversation);
+      throw error;
     }
   }
 
-  function selectConversation(id: string) {
+  // 选择对话
+  async function selectConversation(id: string) {
     currentConversationId.value = id;
+    saveCurrentId();
+
+    // 如果对话没有加载消息，从后端加载
+    const conversation = conversations.value.find((c) => c.id === id);
+    if (conversation && (!conversation.messages || conversation.messages.length === 0)) {
+      try {
+        const loaded = await conversationApi.fetchConversation(id);
+        const index = conversations.value.findIndex((c) => c.id === id);
+        if (index !== -1) {
+          conversations.value[index] = loaded;
+        }
+      } catch (error) {
+        console.error("Failed to load conversation:", error);
+      }
+    }
   }
 
-  function togglePinConversation(id: string) {
+  // 置顶对话
+  async function togglePinConversation(id: string) {
     const conversation = conversations.value.find((c) => c.id === id);
-    if (conversation) {
+    if (!conversation) return;
+
+    // 乐观更新
+    conversation.pinned = !conversation.pinned;
+
+    // 异步保存
+    try {
+      await conversationApi.updateConversation(id, { pinned: conversation.pinned });
+    } catch (error) {
+      console.error("Failed to toggle pin:", error);
+      // 回滚
       conversation.pinned = !conversation.pinned;
-      saveToStorage();
+      throw error;
     }
   }
 
-  function renameConversation(id: string, newTitle: string) {
+  // 重命名对话
+  async function renameConversation(id: string, newTitle: string) {
     const conversation = conversations.value.find((c) => c.id === id);
-    if (conversation) {
-      conversation.title = newTitle;
-      conversation.updatedAt = Date.now();
-      saveToStorage();
+    if (!conversation) return;
+
+    const oldTitle = conversation.title;
+    conversation.title = newTitle;
+    conversation.updatedAt = Date.now();
+
+    // 异步保存
+    try {
+      await conversationApi.updateConversation(id, { title: newTitle });
+    } catch (error) {
+      console.error("Failed to rename conversation:", error);
+      // 回滚
+      conversation.title = oldTitle;
+      throw error;
     }
   }
 
-  function updateConversationSettings(
+  // 更新对话设置
+  async function updateConversationSettings(
     id: string,
-    convSettings: ConversationSettings,
+    convSettings: ConversationSettings
   ) {
     const conversation = conversations.value.find((c) => c.id === id);
-    if (conversation) {
-      conversation.settings = { ...conversation.settings, ...convSettings };
-      conversation.updatedAt = Date.now();
-      saveToStorage();
+    if (!conversation) return;
+
+    const oldSettings = conversation.settings;
+    conversation.settings = { ...conversation.settings, ...convSettings };
+    conversation.updatedAt = Date.now();
+
+    // 异步保存
+    try {
+      await conversationApi.updateConversation(id, { settings: conversation.settings });
+    } catch (error) {
+      console.error("Failed to update settings:", error);
+      // 回滚
+      conversation.settings = oldSettings;
+      throw error;
     }
   }
 
-  function addMessage(
+  // 添加消息
+  async function addMessage(
     role: MessageRole,
     content: MessageContent,
-    conversationId?: string,
-  ): Message {
-    const targetId = conversationId || currentConversationId.value;
+    conversationId?: string
+  ): Promise<Message> {
+    let targetId = conversationId || currentConversationId.value;
 
     if (!targetId) {
-      createConversation();
+      await createConversation();
+      targetId = currentConversationId.value;
     }
 
-    const conversation = conversations.value.find(
-      (c) => c.id === (targetId || currentConversationId.value),
-    );
-
+    const conversation = conversations.value.find((c) => c.id === targetId);
     if (!conversation) {
       throw new Error("Conversation not found");
     }
 
-    const message: any = {
+    const message: Message = {
       id: generateId(),
       role,
       content,
       timestamp: Date.now(),
       isStreaming: false,
-    };
+    } as Message;
 
+    // 乐观更新
     conversation.messages.push(message);
     conversation.updatedAt = Date.now();
 
+    // 如果是第一条用户消息，更新标题
     if (
       role === MessageRole.USER &&
       conversation.messages.length === 1 &&
@@ -144,21 +264,64 @@ export const useChatStore = defineStore("chat", () => {
       conversation.title = extractTitleFromMessage(content.text);
     }
 
-    saveToStorage();
+    // 异步保存（使用增量更新）
+    try {
+      // 确保 targetId 不为空
+      if (targetId) {
+        // 发送消息到后端，不等待完成
+        conversationApi.addMessage(targetId, message).catch((error) => {
+          console.error("Failed to save message:", error);
+        });
+
+        // 如果标题更新了，也保存标题
+        if (
+          role === MessageRole.USER &&
+          conversation.messages.length === 1
+        ) {
+          conversationApi.updateConversation(targetId, { title: conversation.title }).catch((error) => {
+            console.error("Failed to update title:", error);
+          });
+        }
+      }
+    } catch (error) {
+      console.error("Failed to add message:", error);
+    }
+
     return message;
   }
 
-  function updateMessage(messageId: string, updates: Partial<Message>) {
+  // 更新消息
+  async function updateMessage(messageId: string, updates: Partial<Message>) {
     const conversation = currentConversation.value;
-    if (!conversation) return;
+    if (!conversation) {
+      console.warn("[updateMessage] No current conversation");
+      return;
+    }
 
     const message = conversation.messages.find((m) => m.id === messageId);
-    if (message) {
-      Object.assign(message, updates);
-      saveToStorage();
+    if (!message) {
+      console.warn("[updateMessage] Message not found:", messageId);
+      return;
+    }
+
+    // 乐观更新
+    Object.assign(message, updates);
+
+    // 异步保存
+    try {
+      console.log("[updateMessage] Saving to backend:", {
+        conversationId: conversation.id,
+        messageId,
+        content: updates.content,
+      });
+      await conversationApi.updateMessage(conversation.id, messageId, updates);
+      console.log("[updateMessage] Save successful");
+    } catch (error) {
+      console.error("Failed to update message:", error);
     }
   }
 
+  // 更新消息内容（流式更新时使用，不触发 API 调用）
   function updateMessageContent(messageId: string, text: string) {
     const conversation = currentConversation.value;
     if (!conversation) return;
@@ -169,24 +332,49 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
-  function setMessageFeedback(
+  // 保存整个对话（用于流式结束后）
+  async function saveConversation(conversationId: string) {
+    const conversation = conversations.value.find((c) => c.id === conversationId);
+    if (!conversation) return;
+
+    try {
+      await conversationApi.updateConversation(conversationId, {
+        messages: conversation.messages,
+        updatedAt: Date.now()
+      });
+    } catch (error) {
+      console.error("Failed to save conversation:", error);
+    }
+  }
+
+  // 设置消息反馈
+  async function setMessageFeedback(
     messageId: string,
-    feedback: "like" | "dislike" | null,
+    feedback: "like" | "dislike" | null
   ) {
     const conversation = currentConversation.value;
     if (!conversation) return;
 
     const message = conversation.messages.find((m) => m.id === messageId);
-    if (message) {
-      message.feedback = {
-        liked: feedback === "like",
-        disliked: feedback === "dislike",
-        copied: message.feedback?.copied,
-      };
-      saveToStorage();
+    if (!message) return;
+
+    message.feedback = {
+      liked: feedback === "like",
+      disliked: feedback === "dislike",
+      copied: message.feedback?.copied,
+    };
+
+    // 异步保存
+    try {
+      await conversationApi.updateMessage(conversation.id, messageId, {
+        feedback: message.feedback
+      });
+    } catch (error) {
+      console.error("Failed to save feedback:", error);
     }
   }
 
+  // 设置消息已复制
   function setMessageCopied(messageId: string) {
     const conversation = currentConversation.value;
     if (!conversation) return;
@@ -200,11 +388,13 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
+  // 开始流式输出
   function startStreaming() {
     isStreaming.value = true;
     streamController.value = new AbortController();
   }
 
+  // 停止流式输出
   function stopStreaming() {
     isStreaming.value = false;
     if (streamController.value) {
@@ -213,30 +403,23 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
-  function clearConversation(id: string) {
+  // 清空对话消息
+  async function clearConversation(id: string) {
     const conversation = conversations.value.find((c) => c.id === id);
-    if (conversation) {
-      conversation.messages = [];
-      conversation.updatedAt = Date.now();
-      saveToStorage();
-    }
-  }
+    if (!conversation) return;
 
-  function saveToStorage() {
+    conversation.messages = [];
+    conversation.updatedAt = Date.now();
+
+    // 异步保存
     try {
-      localStorage.setItem(
-        "chat-conversations",
-        JSON.stringify(conversations.value),
-      );
-      localStorage.setItem(
-        "chat-current-id",
-        currentConversationId.value || "",
-      );
-    } catch (e) {
-      console.error("Failed to save to storage:", e);
+      await conversationApi.updateConversation(id, { messages: [] });
+    } catch (error) {
+      console.error("Failed to clear conversation:", error);
     }
   }
 
+  // 降级：从 localStorage 加载（仅在 API 不可用时使用）
   function loadFromStorage() {
     try {
       const stored = localStorage.getItem("chat-conversations");
@@ -255,17 +438,40 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
-  loadFromStorage();
+  // 保存到 localStorage（降级模式使用）
+  function saveToStorage() {
+    try {
+      localStorage.setItem(
+        "chat-conversations",
+        JSON.stringify(conversations.value)
+      );
+      localStorage.setItem(
+        "chat-current-id",
+        currentConversationId.value || ""
+      );
+    } catch (e) {
+      console.error("Failed to save to storage:", e);
+    }
+  }
+
+  // 初始化
+  initializeFromApi();
 
   return {
+    // 状态
     conversations,
     currentConversationId,
     isStreaming,
     streamController,
+    isInitialized,
+    isLoading,
+    // 计算属性
     currentConversation,
     sortedConversations,
     pinnedConversations,
     recentConversations,
+    // 方法
+    initializeFromApi,
     createConversation,
     deleteConversation,
     selectConversation,
@@ -275,11 +481,13 @@ export const useChatStore = defineStore("chat", () => {
     addMessage,
     updateMessage,
     updateMessageContent,
+    saveConversation,
     setMessageFeedback,
     setMessageCopied,
     startStreaming,
     stopStreaming,
     clearConversation,
     loadFromStorage,
+    saveToStorage,
   };
-});
+});
\ No newline at end of file
diff --git a/src/stores/settings.ts b/src/stores/settings.ts
index 54376b0..7192e93 100644
--- a/src/stores/settings.ts
+++ b/src/stores/settings.ts
@@ -16,7 +16,7 @@ export const useSettingsStore = defineStore("settings", () => {
     compactMode: false,
 
     // AI 默认设置
-    defaultModel: "glm-4.6",
+    defaultModel: "glm-4.6v",
     defaultTemperature: 0.7,
     defaultMaxTokens: 4096,
     defaultSystemPrompt: "你是一个有帮助的 AI 助手。",
diff --git a/src/utils/migrateData.ts b/src/utils/migrateData.ts
new file mode 100644
index 0000000..ef5c235
--- /dev/null
+++ b/src/utils/migrateData.ts
@@ -0,0 +1,140 @@
+/**
+ * 数据迁移工具
+ *
+ * 将 localStorage 中的旧对话数据迁移到后端 SQLite
+ */
+
+import { conversationApi } from '@/services/conversationApi';
+import type { Conversation } from '@/types/chat';
+
+const OLD_CONVERSATIONS_KEY = 'chat-conversations';
+const MIGRATION_FLAG_KEY = 'chat-migration-completed';
+
+export interface MigrationResult {
+  success: boolean;
+  total: number;
+  migrated: number;
+  failed: number;
+  message: string;
+}
+
+/**
+ * 检查是否已完成迁移
+ */
+export function isMigrationCompleted(): boolean {
+  return localStorage.getItem(MIGRATION_FLAG_KEY) === 'true';
+}
+
+/**
+ * 标记迁移已完成
+ */
+function markMigrationCompleted() {
+  localStorage.setItem(MIGRATION_FLAG_KEY, 'true');
+}
+
+/**
+ * 从 localStorage 读取旧数据
+ */
+function getOldConversations(): Conversation[] {
+  try {
+    const stored = localStorage.getItem(OLD_CONVERSATIONS_KEY);
+    if (stored) {
+      return JSON.parse(stored);
+    }
+  } catch (e) {
+    console.error('Failed to read old conversations:', e);
+  }
+  return [];
+}
+
+/**
+ * 迁移单个对话
+ */
+async function migrateConversation(conversation: Conversation): Promise<boolean> {
+  try {
+    await conversationApi.saveConversation(conversation);
+    return true;
+  } catch (error) {
+    console.error(`Failed to migrate conversation ${conversation.id}:`, error);
+    return false;
+  }
+}
+
+/**
+ * 执行迁移
+ */
+export async function migrateData(): Promise<MigrationResult> {
+  // 检查是否已迁移
+  if (isMigrationCompleted()) {
+    return {
+      success: true,
+      total: 0,
+      migrated: 0,
+      failed: 0,
+      message: '迁移已完成，无需重复执行',
+    };
+  }
+
+  // 读取旧数据
+  const oldConversations = getOldConversations();
+
+  if (oldConversations.length === 0) {
+    markMigrationCompleted();
+    return {
+      success: true,
+      total: 0,
+      migrated: 0,
+      failed: 0,
+      message: '没有需要迁移的数据',
+    };
+  }
+
+  // 迁移数据
+  let migrated = 0;
+  let failed = 0;
+
+  for (const conversation of oldConversations) {
+    const success = await migrateConversation(conversation);
+    if (success) {
+      migrated++;
+    } else {
+      failed++;
+    }
+  }
+
+  // 迁移完成后清理
+  if (migrated === oldConversations.length) {
+    // 全部成功，清理旧数据
+    localStorage.removeItem(OLD_CONVERSATIONS_KEY);
+    markMigrationCompleted();
+  }
+
+  return {
+    success: failed === 0,
+    total: oldConversations.length,
+    migrated,
+    failed,
+    message: failed === 0
+      ? `成功迁移 ${migrated} 条对话`
+      : `迁移完成：成功 ${migrated} 条，失败 ${failed} 条`,
+  };
+}
+
+/**
+ * 清理 localStorage 中的旧数据
+ */
+export function cleanupOldData() {
+  localStorage.removeItem(OLD_CONVERSATIONS_KEY);
+  // 保留 chat-current-id，因为它仍在使用
+}
+
+/**
+ * 导出迁移状态
+ */
+export function getMigrationStatus() {
+  return {
+    completed: isMigrationCompleted(),
+    hasOldData: localStorage.getItem(OLD_CONVERSATIONS_KEY) !== null,
+    oldDataCount: getOldConversations().length,
+  };
+}
\ No newline at end of file
diff --git a/tsconfig.tsbuildinfo b/tsconfig.tsbuildinfo
index 185dfda..6d04746 100644
--- a/tsconfig.tsbuildinfo
+++ b/tsconfig.tsbuildinfo
@@ -1 +1 @@
-{"root":["./src/main.ts","./src/components/icons/index.ts","./src/composables/useKeyboard.ts","./src/services/api.ts","./src/stores/chat.ts","./src/stores/settings.ts","./src/types/chat.ts","./src/utils/helpers.ts","./src/App.vue","./src/components/chat/ChatHeader.vue","./src/components/chat/ChatMain.vue","./src/components/chat/MessageList.vue","./src/components/chat/WelcomeScreen.vue","./src/components/input/AttachmentPreview.vue","./src/components/input/ChatInput.vue","./src/components/message/CodeBlock.vue","./src/components/message/MessageActions.vue","./src/components/message/MessageBubble.vue","./src/components/message/components/EChartsContainerNode.vue","./src/components/message/components/Loading.vue","./src/components/message/components/ThinkingNode.vue","./src/components/modals/ConversationSettingsModal.vue","./src/components/modals/SearchModal.vue","./src/components/modals/SettingsModal.vue","./src/components/modals/ShortcutsModal.vue","./src/components/sidebar/ChatSidebar.vue","./src/components/sidebar/ConversationItem.vue","./src/components/ui/FormSelect.vue","./src/components/ui/FormSlider.vue","./src/components/ui/FormSwitch.vue"],"errors":true,"version":"5.9.3"}
\ No newline at end of file
+{"root":["./src/main.ts","./src/components/icons/index.ts","./src/composables/useKeyboard.ts","./src/services/api.ts","./src/services/authService.ts","./src/services/conversationApi.ts","./src/stores/chat.ts","./src/stores/settings.ts","./src/types/chat.ts","./src/utils/helpers.ts","./src/utils/migrateData.ts","./src/App.vue","./src/components/chat/ChatHeader.vue","./src/components/chat/ChatMain.vue","./src/components/chat/MessageList.vue","./src/components/chat/WelcomeScreen.vue","./src/components/input/AttachmentPreview.vue","./src/components/input/ChatInput.vue","./src/components/message/CodeBlock.vue","./src/components/message/MessageActions.vue","./src/components/message/MessageBubble.vue","./src/components/message/components/EChartsContainerNode.vue","./src/components/message/components/Loading.vue","./src/components/message/components/ThinkingNode.vue","./src/components/modals/ConversationSettingsModal.vue","./src/components/modals/SearchModal.vue","./src/components/modals/SettingsModal.vue","./src/components/modals/ShortcutsModal.vue","./src/components/sidebar/ChatSidebar.vue","./src/components/sidebar/ConversationItem.vue","./src/components/ui/FormSelect.vue","./src/components/ui/FormSlider.vue","./src/components/ui/FormSwitch.vue"],"errors":true,"version":"5.9.3"}
\ No newline at end of file