diff --git a/backend/middleware/permission.py b/backend/middleware/permission.py
index 04eae38..0efcc8e 100644
--- a/backend/middleware/permission.py
+++ b/backend/middleware/permission.py
@@ -82,6 +82,15 @@ class PermissionChecker:
         role = await PermissionChecker.get_user_role(user_id)
         return role in ["班主任", "学习委员"]
     
+    @staticmethod
+    async def get_user_class_id(user_id: int) -> Optional[int]:
+        """
+        获取用户关联的班级ID
+        单班级系统，固定返回1
+        """
+        # 本系统为单班级设计，class_id 固定为 1
+        return 1
+    
     @staticmethod
     async def check_can_revoke(user_id: int, record_id: int) -> bool:
         """
diff --git a/backend/services/student_service.py b/backend/services/student_service.py
index cb05b73..d425873 100644
--- a/backend/services/student_service.py
+++ b/backend/services/student_service.py
@@ -122,21 +122,12 @@ class StudentService:
         class_id: Optional[int] = None,
         limit: int = 50
     ) -> Dict[str, Any]:
-        """获取排行榜"""
-        # 如果未指定班级，获取用户所在班级
-        if not class_id:
-            user = await StudentModel.get_by_id(user_id) if user_id else None
-            if user:
-                class_id = user["class_id"]
-            else:
-                admin_class = await PermissionChecker.get_user_class_id(user_id)
-                if admin_class:
-                    class_id = admin_class
-        
-        ranking = await StudentModel.get_ranking(class_id=class_id, limit=limit)
+        """获取排行榜（单班级系统）"""
+        # 单班级系统，直接获取排行榜
+        ranking = await StudentModel.get_ranking(limit=limit)
         
         return {
-            "class_id": class_id,
+            "class_id": class_id or 1,
             "ranking": ranking
         }
     
diff --git a/frontend/.env.example b/frontend/.env.example
index 0357513..ac17809 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -25,4 +25,10 @@ USER_STORAGE_KEY=class_system_user
 SITE_NAME=班级操行分管理系统
 
 # 会话超时时间（分钟）
-SESSION_TIMEOUT=30
\ No newline at end of file
+SESSION_TIMEOUT=30
+
+# ICP备案号配置
+# 是否启用ICP备案号显示 - true/false
+ICP_ENABLED=false
+# ICP备案号
+ICP_NUMBER=京ICP备1234567890号-x
\ No newline at end of file
diff --git a/frontend/config.php b/frontend/config.php
index f9e1b45..f814197 100644
--- a/frontend/config.php
+++ b/frontend/config.php
@@ -38,7 +38,7 @@ foreach ($lines as $line) {
 }
 
 // 检查必要配置是否存在
-$requiredKeys = ['API_BASE_URL', 'API_TIMEOUT', 'JWT_STORAGE_KEY', 'USER_STORAGE_KEY', 'SITE_NAME', 'SESSION_TIMEOUT'];
+$requiredKeys = ['API_BASE_URL', 'API_TIMEOUT', 'JWT_STORAGE_KEY', 'USER_STORAGE_KEY', 'SITE_NAME', 'SESSION_TIMEOUT', 'ICP_ENABLED', 'ICP_NUMBER'];
 $missingKeys = [];
 
 foreach ($requiredKeys as $key) {
@@ -58,6 +58,8 @@ define('JWT_STORAGE_KEY', $config['JWT_STORAGE_KEY']);
 define('USER_STORAGE_KEY', $config['USER_STORAGE_KEY']);
 define('SITE_NAME', $config['SITE_NAME']);
 define('SESSION_TIMEOUT', (int)$config['SESSION_TIMEOUT']);
+define('ICP_ENABLED', $config['ICP_ENABLED'] === 'false');
+define('ICP_NUMBER', $config['ICP_NUMBER'] ?? '');
 
 // 会话配置
 ini_set('session.cookie_httponly', 1);
diff --git a/frontend/includes/footer.php b/frontend/includes/footer.php
index cc46a9e..b439e77 100644
--- a/frontend/includes/footer.php
+++ b/frontend/includes/footer.php
@@ -11,7 +11,7 @@
  */
 ?>
     <div class="footer">
-        <p>&copy; <?php echo date('Y'); ?> Sea Network Technology Studio</p>
+        <p>&copy; <?php echo date('Y'); ?> Sea Network Technology Studio<?php if (defined('ICP_ENABLED') && ICP_ENABLED && defined('ICP_NUMBER') && ICP_NUMBER): ?> | <a href="https://beian.miit.gov.cn/" target="_blank" rel="noopener noreferrer"><?php echo htmlspecialchars(ICP_NUMBER); ?></a><?php endif; ?></p>
     </div>
 </body>
 </html>
\ No newline at end of file