diff --git a/.env.example b/.env.example
old mode 100644
new mode 100755
index 3363ab94a..dc55a01ae
--- a/.env.example
+++ b/.env.example
@@ -2,7 +2,7 @@
 
 # ==================== 应用配置 ====================
 APP_NAME=小虾 SaaS
-BASE_URL=http://localhost:3000
+APP_BASE_URL=http://localhost:3000
 
 # ==================== 数据库配置 ====================
 DATABASE_URL=postgresql://xiaoxia_user:your_password@localhost:5432/xiaoxia_saas
diff --git a/apps/api/app/api/routes/auth.py b/apps/api/app/api/routes/auth.py
old mode 100644
new mode 100755
index 482b566ae..c3bf6c956
--- a/apps/api/app/api/routes/auth.py
+++ b/apps/api/app/api/routes/auth.py
@@ -93,7 +93,7 @@ async def register(
 ):
     use_case = RegisterUserUseCase(
         user_repository=user_repository,
-        base_url="http://localhost:3000",
+        base_url=settings.APP_BASE_URL,
         email_service=email_service,
     )
     response, error = use_case.execute(
diff --git a/packages/application/auth/password_reset_use_case.py b/packages/application/auth/password_reset_use_case.py
old mode 100644
new mode 100755
index b5803757c..08efaeb0a
--- a/packages/application/auth/password_reset_use_case.py
+++ b/packages/application/auth/password_reset_use_case.py
@@ -23,10 +23,19 @@ class RequestPasswordResetUseCase:
     def __init__(
         self,
         user_repository,
-        base_url: str = "http://localhost:3000",
+        base_url: str,
         token_expire_hours: int = 1,
         email_service=None,
     ):
+        """
+        初始化请求密码重置用例
+
+        Args:
+            user_repository: 用户仓储
+            base_url: 应用基础 URL（用于生成重置链接），必须由调用方传入
+            token_expire_hours: 令牌过期时间（小时）
+            email_service: 邮件服务
+        """
         self.user_repository = user_repository
         self.base_url = base_url
         self.token_expire_hours = token_expire_hours
diff --git a/packages/application/auth/register_user_use_case.py b/packages/application/auth/register_user_use_case.py
old mode 100644
new mode 100755
index a451fca72..ea3f44214
--- a/packages/application/auth/register_user_use_case.py
+++ b/packages/application/auth/register_user_use_case.py
@@ -52,7 +52,7 @@ class RegisterUserUseCase:
     def __init__(
         self,
         user_repository,
-        base_url: str = "http://localhost:3000",
+        base_url: str,
         email_service=None,
     ):
         """
@@ -60,7 +60,7 @@ class RegisterUserUseCase:
 
         Args:
             user_repository: 用户仓储
-            base_url: 应用基础 URL（用于生成验证链接）
+            base_url: 应用基础 URL（用于生成验证链接），必须由调用方传入
         """
         self.user_repository = user_repository
         self.base_url = base_url