diff --git a/.gitignore b/.gitignore
index cd1614f..6c7312c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ build/
 .idea/
 *.log
 /.build/
+/XuqmDemo/.build/
diff --git a/Sources/XuqmSDK/Core/XuqmSDK.swift b/Sources/XuqmSDK/Core/XuqmSDK.swift
index 44af928..ac07ddc 100644
--- a/Sources/XuqmSDK/Core/XuqmSDK.swift
+++ b/Sources/XuqmSDK/Core/XuqmSDK.swift
@@ -8,10 +8,8 @@ public final class XuqmSDK: NSObject {
     private(set) var tokenStore: TokenStore?
 
     public private(set) var currentUserId: String?
-    public var onUserSigExpired: (() -> Void)?
 
     private var userSig: String?
-    private var userSigTimer: Timer?
     private var cachedDeviceToken: String?
 
     private override init() {
@@ -34,7 +32,6 @@ public final class XuqmSDK: NSObject {
     public func login(userId: String, userSig: String) async {
         self.currentUserId = userId
         self.userSig = userSig
-        startUserSigExpirationTimer(userSig: userSig)
 
         do {
             try await ImSDK.shared.loginWithUserSig(userId, userSig)
@@ -52,9 +49,6 @@ public final class XuqmSDK: NSObject {
     }
 
     public func logout() async {
-        userSigTimer?.invalidate()
-        userSigTimer = nil
-
         ImSDK.shared.disconnect()
 
         if let userId = currentUserId {
@@ -81,42 +75,4 @@ public final class XuqmSDK: NSObject {
         }
     }
 
-    private func startUserSigExpirationTimer(userSig: String) {
-        userSigTimer?.invalidate()
-        guard let expDate = extractExpirationDate(from: userSig) else { return }
-        let interval = expDate.timeIntervalSinceNow - 300 // 5 minutes before expiry
-        guard interval > 0 else {
-            onUserSigExpired?()
-            return
-        }
-        userSigTimer = Timer.scheduledTimer(
-            timeInterval: interval,
-            target: self,
-            selector: #selector(userSigDidExpire),
-            userInfo: nil,
-            repeats: false
-        )
-    }
-
-    @objc private func userSigDidExpire() {
-        onUserSigExpired?()
-    }
-
-    private func extractExpirationDate(from userSig: String) -> Date? {
-        let parts = userSig.split(separator: ".")
-        guard parts.count >= 2 else { return nil }
-        var base64 = String(parts[1])
-            .replacingOccurrences(of: "-", with: "+")
-            .replacingOccurrences(of: "_", with: "/")
-        let padding = 4 - base64.count % 4
-        if padding != 4 {
-            base64 += String(repeating: "=", count: padding)
-        }
-        guard let data = Data(base64Encoded: base64),
-              let json = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
-              let exp = json["exp"] as? TimeInterval else {
-            return nil
-        }
-        return Date(timeIntervalSince1970: exp)
-    }
 }
diff --git a/Sources/XuqmSDK/IM/ImSDK.swift b/Sources/XuqmSDK/IM/ImSDK.swift
index dacafa7..bb4efca 100644
--- a/Sources/XuqmSDK/IM/ImSDK.swift
+++ b/Sources/XuqmSDK/IM/ImSDK.swift
@@ -36,15 +36,13 @@ public final class ImSDK {
         client?.connect()
     }
 
-    public func login(userId: String, nickname: String? = nil, avatar: String? = nil) async throws {
+    public func login(userId: String) async throws {
         let config = XuqmSDK.shared.requireConfig()
 
-        var items = [
+        let items = [
             URLQueryItem(name: "appId", value: config.appId),
             URLQueryItem(name: "userId", value: userId),
         ]
-        if let nickname { items.append(URLQueryItem(name: "nickname", value: nickname)) }
-        if let avatar { items.append(URLQueryItem(name: "avatar", value: avatar)) }
 
         let res: ImLoginResponse = try await ApiClient.shared.request(
             path: "/api/im/auth/login",