diff --git a/docs/README.md b/docs/README.md
index 6af8641..242b28b 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -16,6 +16,7 @@
 | 配置项 | 值 |
 |--------|-----|
 | API 域名 | `https://dev.xuqinmin.com` |
+| 登录服务 | `demo-service`（`/api/demo/auth/*`） |
 | IM WebSocket | `wss://dev.xuqinmin.com/ws/im` |
 | 演示 AppId | `ak_demo_chat` |
 | 演示用户 | `demo_alice`（Alice）、`demo_bob`（Bob） |
@@ -136,6 +137,7 @@ cd XuqmGroup-RNChatDemo
 
 | 路径前缀 | 对应服务 | 端口 |
 |----------|---------|-----|
+| `/api/demo/` | demo-service | 8085 |
 | `/api/im/` | im-service | 8082 |
 | `/ws/im` | im-service (WebSocket) | 8082 |
 | `/api/v1/updates/` | update-service | 8084 |
@@ -144,6 +146,8 @@ cd XuqmGroup-RNChatDemo
 
 所有接口通过 Nginx 反代至 `https://dev.xuqinmin.com`。
 
+`demo-service` 负责 demo 账号体系的注册、登录、找回密码和资料更新；登录成功后会返回 `demoToken`、`imToken` 和 `profile`。其中 `profile.appId` 用于后续初始化 IM 和更新能力，不走租户服务登录链路。
+
 ---
 
 ## 注意事项
diff --git a/scripts/publish-demo-assets.sh b/scripts/publish-demo-assets.sh
index d9359df..e39d0b9 100755
--- a/scripts/publish-demo-assets.sh
+++ b/scripts/publish-demo-assets.sh
@@ -2,7 +2,7 @@
 
 set -euo pipefail
 
-BASE_URL="${BASE_URL:-https://sentry.xuqinmin.com}"
+BASE_URL="${BASE_URL:-https://dev.xuqinmin.com}"
 APP_ID="${APP_ID:-ak_demo_chat}"
 MODULE_ID="${MODULE_ID:-chat-home}"
 
diff --git a/src/api/demo.ts b/src/api/demo.ts
index 50edd4f..f60bf8c 100644
--- a/src/api/demo.ts
+++ b/src/api/demo.ts
@@ -33,6 +33,7 @@ async function request<T>(
 }
 
 export interface UserProfile {
+  appId: string
   userId: string
   nickname: string
   avatar: string
diff --git a/src/context/AuthContext.tsx b/src/context/AuthContext.tsx
index 025be3a..804bacd 100644
--- a/src/context/AuthContext.tsx
+++ b/src/context/AuthContext.tsx
@@ -8,6 +8,10 @@ import pluginMeta from '../../plugin.json'
 const APP_ID = 'ak_demo_chat'
 const SERVER_URL = 'https://dev.xuqinmin.com'
 
+function buildImDbName(appId: string, userId: string): string {
+  return `xuqm_im_${appId}_${userId}`
+}
+
 interface AuthState {
   ready: boolean
   userId: string | null
@@ -27,10 +31,11 @@ const AuthContext = createContext<AuthContextValue | null>(null)
 export function AuthProvider({ children }: { children: React.ReactNode }) {
   const [state, setState] = useState<AuthState>({ ready: false, userId: null, profile: null })
 
-  const initSDK = useCallback(async (userId: string, imToken: string, profile: UserProfile) => {
-    await XuqmSDK.initialize({ appId: APP_ID, serverUrl: SERVER_URL })
-    await ImSDK.loginWithToken(userId, imToken, 'xuqm_im')
-    setState({ ready: true, userId, profile })
+  const initSDK = useCallback(async (profile: UserProfile, imToken: string) => {
+    const appId = profile.appId || APP_ID
+    await XuqmSDK.initialize({ appId, serverUrl: SERVER_URL })
+    await ImSDK.loginWithToken(profile.userId, imToken, buildImDbName(appId, profile.userId))
+    setState({ ready: true, userId: profile.userId, profile })
 
     UpdateSDK.checkAppUpdate()
       .then(update => {
@@ -57,7 +62,7 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
         const imToken = await load<string>(K.IM_TOKEN)
         const profile = await load<UserProfile>(K.PROFILE)
         if (demoToken && imToken && profile) {
-          await initSDK(profile.userId, imToken, profile)
+          await initSDK(profile, imToken)
           return
         }
       } catch {
@@ -72,7 +77,7 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
     await save(K.DEMO_TOKEN, result.demoToken)
     await save(K.IM_TOKEN, result.imToken)
     await save(K.PROFILE, result.profile)
-    await initSDK(result.profile.userId, result.imToken, result.profile)
+    await initSDK(result.profile, result.imToken)
   }, [initSDK])
 
   const login = useCallback(async (userId: string, password: string) => {
diff --git a/src/screens/conversation/ConversationListScreen.tsx b/src/screens/conversation/ConversationListScreen.tsx
index 974aafa..4b72a15 100644
--- a/src/screens/conversation/ConversationListScreen.tsx
+++ b/src/screens/conversation/ConversationListScreen.tsx
@@ -18,6 +18,7 @@ interface ConvWithMeta extends ConversationData {
 }
 
 export default function ConversationListScreen() {
+  const appId = 'ak_demo_chat'
   const navigation = useNavigation<Nav>()
   const [conversations, setConversations] = useState<ConvWithMeta[]>([])
   const profileCache = useRef<Record<string, UserProfile>>({})
@@ -27,10 +28,10 @@ export default function ConversationListScreen() {
     if (!profile) {
       try {
         const results = await demoApi.searchUsers(conv.targetId)
-        profile = results.find(u => u.userId === conv.targetId) ?? { userId: conv.targetId, nickname: conv.targetId, avatar: '', gender: 'UNKNOWN', status: '' }
+        profile = results.find(u => u.userId === conv.targetId) ?? { appId, userId: conv.targetId, nickname: conv.targetId, avatar: '', gender: 'UNKNOWN', status: '' }
         profileCache.current[conv.targetId] = profile
       } catch {
-        profile = { userId: conv.targetId, nickname: conv.targetId, avatar: '', gender: 'UNKNOWN', status: '' }
+        profile = { appId, userId: conv.targetId, nickname: conv.targetId, avatar: '', gender: 'UNKNOWN', status: '' }
       }
     }
     return { ...conv, targetName: profile.nickname, targetAvatar: profile.avatar }
diff --git a/src/screens/group/GroupMembersScreen.tsx b/src/screens/group/GroupMembersScreen.tsx
index 7f3d3d0..743179d 100644
--- a/src/screens/group/GroupMembersScreen.tsx
+++ b/src/screens/group/GroupMembersScreen.tsx
@@ -12,6 +12,7 @@ type Props = NativeStackScreenProps<RootStackParams, 'GroupMembers'>
 
 export default function GroupMembersScreen({ route }: Props) {
   const { groupId, groupName } = route.params
+  const appId = 'ak_demo_chat'
   const navigation = useNavigation()
   const [members, setMembers] = useState<UserProfile[]>([])
   const [loading, setLoading] = useState(true)
@@ -28,7 +29,7 @@ export default function GroupMembersScreen({ route }: Props) {
       const profiles = await Promise.all(
         ids.map(async id => {
           const res = await demoApi.searchUsers(id)
-          return res.find(u => u.userId === id) ?? { userId: id, nickname: id, avatar: '', gender: 'UNKNOWN' as const, status: '' }
+          return res.find(u => u.userId === id) ?? { appId, userId: id, nickname: id, avatar: '', gender: 'UNKNOWN' as const, status: '' }
         })
       )
       setMembers(profiles)