diff --git a/src/api/demo.ts b/src/api/demo.ts
index f60bf8c..85d9fc9 100644
--- a/src/api/demo.ts
+++ b/src/api/demo.ts
@@ -43,7 +43,9 @@ export interface UserProfile {
 
 export interface AuthResult {
   demoToken: string
+  demoTokenExpiresAt?: number | null
   imToken: string
+  imTokenExpiresAt?: number | null
   profile: UserProfile
 }
 
@@ -64,6 +66,14 @@ export const demoApi = {
     })
   },
 
+  refreshImToken(appId: string = APP_ID): Promise<{ imToken: string; imTokenExpiresAt?: number | null }> {
+    return request('/auth/refresh-im', {
+      method: 'POST',
+      skipAuth: false,
+      params: { appId },
+    })
+  },
+
   getProfile(): Promise<UserProfile> {
     return request('/user/profile')
   },
diff --git a/src/context/AuthContext.tsx b/src/context/AuthContext.tsx
index ab954d3..4167be0 100644
--- a/src/context/AuthContext.tsx
+++ b/src/context/AuthContext.tsx
@@ -1,16 +1,12 @@
 import React, { createContext, useCallback, useContext, useEffect, useState } from 'react'
 import { Alert, Linking } from 'react-native'
-import { XuqmSDK, ImSDK, UpdateSDK } from '@xuqm/rn-sdk'
+import { XuqmSDK, UpdateSDK } from '@xuqm/rn-sdk'
 import { demoApi, type UserProfile } from '../api/demo'
 import { save, load, clearSession, K } from '../utils/storage'
 import pluginMeta from '../../plugin.json'
 
 const APP_ID = 'ak_demo_chat'
 
-function buildImDbName(appId: string, userId: string): string {
-  return `xuqm_im_${appId}_${userId}`
-}
-
 interface AuthState {
   ready: boolean
   userId: string | null
@@ -30,11 +26,21 @@ 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 (profile: UserProfile, imToken: string) => {
+  const initSDK = useCallback(async (profile: UserProfile, imToken: string, imTokenExpiresAt?: number | null) => {
     const appKey = profile.appId || APP_ID
     await XuqmSDK.initialize({ appKey })
-    const appId = appKey
-    await ImSDK.loginWithToken(profile.userId, imToken, buildImDbName(appId, profile.userId))
+    await XuqmSDK.login({
+      userId: profile.userId,
+      userSig: imToken,
+      expiresAt: imTokenExpiresAt ?? undefined,
+      profile,
+      refreshUserSig: async () => {
+        const refreshed = await demoApi.refreshImToken(appKey)
+        await save(K.IM_TOKEN, refreshed.imToken)
+        await save(K.IM_TOKEN_EXPIRES_AT, refreshed.imTokenExpiresAt ?? null)
+        return { userSig: refreshed.imToken, expiresAt: refreshed.imTokenExpiresAt ?? undefined }
+      },
+    })
     setState({ ready: true, userId: profile.userId, profile })
 
     UpdateSDK.checkAppUpdate()
@@ -60,9 +66,10 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
       try {
         const demoToken = await load<string>(K.DEMO_TOKEN)
         const imToken = await load<string>(K.IM_TOKEN)
+        const imTokenExpiresAt = await load<number | null>(K.IM_TOKEN_EXPIRES_AT)
         const profile = await load<UserProfile>(K.PROFILE)
         if (demoToken && imToken && profile) {
-          await initSDK(profile, imToken)
+          await initSDK(profile, imToken, imTokenExpiresAt ?? undefined)
           return
         }
       } catch {
@@ -73,11 +80,12 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
     restore()
   }, [initSDK])
 
-  const handleAuthResult = useCallback(async (result: { demoToken: string; imToken: string; profile: UserProfile }) => {
+  const handleAuthResult = useCallback(async (result: { demoToken: string; demoTokenExpiresAt?: number | null; imToken: string; imTokenExpiresAt?: number | null; profile: UserProfile }) => {
     await save(K.DEMO_TOKEN, result.demoToken)
     await save(K.IM_TOKEN, result.imToken)
+    await save(K.IM_TOKEN_EXPIRES_AT, result.imTokenExpiresAt ?? null)
     await save(K.PROFILE, result.profile)
-    await initSDK(result.profile, result.imToken)
+    await initSDK(result.profile, result.imToken, result.imTokenExpiresAt ?? undefined)
   }, [initSDK])
 
   const login = useCallback(async (userId: string, password: string) => {
@@ -91,7 +99,7 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
   }, [handleAuthResult])
 
   const logout = useCallback(async () => {
-    ImSDK.disconnect()
+    await XuqmSDK.logout()
     await clearSession()
     setState({ ready: true, userId: null, profile: null })
   }, [])
diff --git a/src/utils/storage.ts b/src/utils/storage.ts
index 827e775..356fa63 100644
--- a/src/utils/storage.ts
+++ b/src/utils/storage.ts
@@ -3,6 +3,7 @@ import AsyncStorage from '@react-native-async-storage/async-storage'
 export const K = {
   DEMO_TOKEN: '@xuqm:demoToken',
   IM_TOKEN:   '@xuqm:imToken',
+  IM_TOKEN_EXPIRES_AT: '@xuqm:imTokenExpiresAt',
   PROFILE:    '@xuqm:profile',
   CONTACTS:   '@xuqm:contacts',
 } as const
@@ -22,5 +23,5 @@ export async function remove(key: string): Promise<void> {
 }
 
 export async function clearSession(): Promise<void> {
-  await Promise.all([K.DEMO_TOKEN, K.IM_TOKEN, K.PROFILE].map(k => AsyncStorage.removeItem(k)))
+  await Promise.all([K.DEMO_TOKEN, K.IM_TOKEN, K.IM_TOKEN_EXPIRES_AT, K.PROFILE].map(k => AsyncStorage.removeItem(k)))
 }