diff --git a/nas-media-player.py b/nas-media-player.py
index 82543c4..c938e69 100644
--- a/nas-media-player.py
+++ b/nas-media-player.py
@@ -261,9 +261,11 @@ async def read_root():
 
 
 @app.get("/api/directories")
-async def get_directories():
-    def traverse(path: Path, rel_path: str = "") -> List[Dict]:
+async def get_directories(max_depth: int = 3):
+    def traverse(path: Path, rel_path: str = "", depth: int = 0) -> List[Dict]:
         items = []
+        if depth >= max_depth:
+            return items  # 超过深度限制，返回空列表
         try:
             for d in sorted(path.iterdir(), key=lambda x: _natural_sort_key(x.name)):
                 if d.is_dir() and not d.name.startswith('.'):
@@ -273,7 +275,7 @@ async def get_directories():
                         "path": sub_rel,
                         "type": "directory",
                         "protected": is_protected_directory(sub_rel),
-                        "children": traverse(d, sub_rel)
+                        "children": traverse(d, sub_rel, depth + 1)
                     })
         except PermissionError:
             logger.warning(f"目录无读取权限: {path}")
@@ -286,10 +288,12 @@ async def get_directories():
 
 
 @app.get("/api/all-directories")
-async def get_all_directories():
+async def get_all_directories(max_depth: int = 3):
     all_dirs = []
 
-    def traverse(path: Path, rel_path: str = ""):
+    def traverse(path: Path, rel_path: str = "", depth: int = 0):
+        if depth >= max_depth:
+            return  # 超过深度限制，停止遍历
         all_dirs.append({
             "name": rel_path if rel_path else "主目录",
             "path": rel_path,
@@ -299,7 +303,7 @@ async def get_all_directories():
             for d in sorted(path.iterdir(), key=lambda x: _natural_sort_key(x.name)):
                 if d.is_dir() and not d.name.startswith('.'):
                     sub_rel = f"{rel_path}/{d.name}" if rel_path else d.name
-                    traverse(d, sub_rel)
+                    traverse(d, sub_rel, depth + 1)
         except PermissionError:
             logger.warning(f"目录无读取权限: {path}")
         except Exception as e:
diff --git a/override.py b/override.py
index 022aa61..cbc12af 100644
--- a/override.py
+++ b/override.py
@@ -279,9 +279,11 @@ async def read_root():
 
 
 @app.get("/api/directories")
-async def get_directories():
-    def traverse(path: Path, rel_path: str = "") -> List[Dict]:
+async def get_directories(max_depth: int = 3):
+    def traverse(path: Path, rel_path: str = "", depth: int = 0) -> List[Dict]:
         items = []
+        if depth >= max_depth:
+            return items  # 超过深度限制，返回空列表
         try:
             for d in sorted(path.iterdir(), key=lambda x: _natural_sort_key(x.name)):
                 if d.is_dir() and not d.name.startswith('.'):
@@ -291,7 +293,7 @@ async def get_directories():
                         "path": sub_rel,
                         "type": "directory",
                         "protected": is_protected_directory(sub_rel),
-                        "children": traverse(d, sub_rel)
+                        "children": traverse(d, sub_rel, depth + 1)
                     })
         except PermissionError:
             logger.warning(f"目录无读取权限: {path}")
@@ -304,10 +306,12 @@ async def get_directories():
 
 
 @app.get("/api/all-directories")
-async def get_all_directories():
+async def get_all_directories(max_depth: int = 3):
     all_dirs = []
 
-    def traverse(path: Path, rel_path: str = ""):
+    def traverse(path: Path, rel_path: str = "", depth: int = 0):
+        if depth >= max_depth:
+            return  # 超过深度限制，停止遍历
         all_dirs.append({
             "name": rel_path if rel_path else "主目录",
             "path": rel_path,
@@ -317,7 +321,7 @@ async def get_all_directories():
             for d in sorted(path.iterdir(), key=lambda x: _natural_sort_key(x.name)):
                 if d.is_dir() and not d.name.startswith('.'):
                     sub_rel = f"{rel_path}/{d.name}" if rel_path else d.name
-                    traverse(d, sub_rel)
+                    traverse(d, sub_rel, depth + 1)
         except PermissionError:
             logger.warning(f"目录无读取权限: {path}")
         except Exception as e:
diff --git a/releases/nas-media-player-arm64 b/releases/nas-media-player-arm64
deleted file mode 100755
index 5e25608..0000000
Binary files a/releases/nas-media-player-arm64 and /dev/null differ
diff --git a/releases/nas-media-player-armhf b/releases/nas-media-player-armhf
deleted file mode 100755
index afe7669..0000000
Binary files a/releases/nas-media-player-armhf and /dev/null differ
diff --git a/zhinan.html b/zhinan.html
index b633998..8312dbc 100644
--- a/zhinan.html
+++ b/zhinan.html
@@ -194,7 +194,7 @@
                 <h3>媒体播放操作</h3>
                 <ol>
                     <li>登录系统后，左侧/上方的目录选择下拉框中选择媒体文件所在的子目录</li>
-                    <li>系统会自动扫描该目录下的所有支持格式媒体文件，并显示在媒体选择下拉框中</li>
+                    <li>系统会自动扫描该目录下<strong>最多3层子目录</strong>中的所有支持格式媒体文件，并显示在媒体选择下拉框中</li>
                     <li>选择要播放的文件：
                         <ul>
                             <li>方式一：直接点击媒体选择下拉框中的目标文件</li>
@@ -208,6 +208,10 @@
                         </ul>
                     </li>
                 </ol>
+                <div class="note">
+                    <strong>目录扫描说明</strong>：<br>
+                    为提升性能和响应速度，系统默认只扫描目录结构的<strong>前3层</strong>。如果您的媒体文件位于更深层的子目录中，可以通过API参数调整扫描深度，例如：<code>GET /api/directories?max_depth=5</code>（扫描5层）。如需永久调整默认深度，请修改程序代码中的默认参数。
+                </div>
             </div>
         </div>
 
@@ -374,7 +378,7 @@
             </tr>
             <tr>
                 <td>如何修改媒体根目录？</td>
-                <td>编辑后端主文件（/opt/nas-media-player/main.py）中的<code>VIDEO_ROOT</code>变量，修改为新的目录路径，保存后重启服务即可生效（需确保新目录有读写权限）。</td>
+                <td>编辑后端主文件（/opt/nas-media-player/nas-media-player.py）中的<code>VIDEO_ROOT</code>变量，修改为新的目录路径，保存后重启服务即可生效（需确保新目录有读写权限）。</td>
             </tr>
             <tr>
                 <td>加密目录的密码忘记了怎么办？</td>
@@ -394,7 +398,7 @@
             </tr>
             <tr>
                 <td>如何修改服务端口（非8800）？</td>
-                <td>启动服务时修改端口参数，如<code>/opt/nas-media-player/main.py</code>（改为8888端口），同时需确保新端口未被占用且防火墙已开放。</td>
+                <td>启动服务时修改端口参数，如<code>/opt/nas-media-player/override.py</code>（改为8888端口），同时需确保新端口未被占用且防火墙已开放。</td>
             </tr>
         </table>
     </div>