diff --git a/server/api/conversation_routes.py b/server/api/conversation_routes.py
index 88f56ca..a0d636f 100644
--- a/server/api/conversation_routes.py
+++ b/server/api/conversation_routes.py
@@ -28,10 +28,10 @@ upload_dir.mkdir(exist_ok=True)
 # ── 会话管理 ─────────────────────────────────────────────────────
 
 
-async def get_conversations_handler():
+async def get_conversations_handler(user_id: str = "default"):
     """获取所有对话处理器"""
     db = get_db()
-    return db.list_conversations()
+    return db.list_conversations(user_id)
 
 
 async def get_conversation_handler(conversation_id: str):
diff --git a/server/main.py b/server/main.py
index 9f1919e..e0c415b 100644
--- a/server/main.py
+++ b/server/main.py
@@ -173,8 +173,8 @@ async def get_models():
 
 
 @app.get("/api/chat-ui/conversations")
-async def get_conversations():
-    return await get_conversations_handler()
+async def get_conversations(user_id: str = "default"):
+    return await get_conversations_handler(user_id)
 
 
 @app.get("/api/chat-ui/conversations/{conversation_id}")
diff --git a/src/services/conversationApi.ts b/src/services/conversationApi.ts
index 54e0551..9ac3aca 100644
--- a/src/services/conversationApi.ts
+++ b/src/services/conversationApi.ts
@@ -5,6 +5,7 @@
  */
 
 import { getAuthHeaders } from './request';
+import { useAuthStore } from '@/stores/auth';
 import type { Conversation, Message, MessageContent, ConversationSettings } from '@/types/chat';
 
 // API 端点
@@ -81,10 +82,11 @@ function transformMessage(backendMsg: BackendMessage): Message {
 /**
  * 将前端对话格式转换为后端格式
  */
-function toBackendFormat(conversation: Partial<Conversation>): Record<string, unknown> {
+function toBackendFormat(conversation: Partial<Conversation>, userId?: string): Record<string, unknown> {
   const data: Record<string, unknown> = {};
 
   if (conversation.id !== undefined) data.id = conversation.id;
+  if (userId !== undefined) data.user_id = userId;  // 后端使用下划线命名
   if (conversation.title !== undefined) data.title = conversation.title;
   if (conversation.createdAt !== undefined) data.createdAt = conversation.createdAt;
   if (conversation.updatedAt !== undefined) data.updatedAt = conversation.updatedAt;
@@ -112,7 +114,15 @@ 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, {
+    const authStore = useAuthStore();
+    const userId = authStore.userId;
+
+    // 构建 URL，添加 user_id 查询参数
+    const url = userId
+      ? `${ENDPOINTS.CONVERSATIONS}?user_id=${encodeURIComponent(userId)}`
+      : ENDPOINTS.CONVERSATIONS;
+
+    const response = await fetch(url, {
       method: 'GET',
       headers: getHeaders(),
     });
@@ -149,10 +159,13 @@ export const conversationApi = {
    * 创建新对话
    */
   async createConversation(data: Partial<Conversation>): Promise<Conversation> {
+    const authStore = useAuthStore();
+    const userId = authStore.userId || undefined;
+
     const response = await fetch(ENDPOINTS.CONVERSATIONS, {
       method: 'POST',
       headers: getHeaders(),
-      body: JSON.stringify(toBackendFormat(data)),
+      body: JSON.stringify(toBackendFormat(data, userId)),
     });
 
     if (!response.ok) {