diff --git a/backend/config.py b/backend/config.py
index 4d0cfc3..c7184b5 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -18,7 +18,7 @@ else:
 # JWT 认证
 SECRET_KEY = os.getenv("SECRET_KEY", "airlabs-project-secret-key-change-in-production")
 ALGORITHM = "HS256"
-ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24  # 24 小时
+ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 90  # 90 天
 
 # CORS
 CORS_ORIGINS = os.getenv("CORS_ORIGINS", "*").split(",")