diff --git a/core/http_file_server.py b/core/http_file_server.py
index 0a18045..355bc97 100644
--- a/core/http_file_server.py
+++ b/core/http_file_server.py
@@ -617,8 +617,7 @@ class StreamingFileServer:
 class HTTPFileServer(StreamingFileServer):
     """高级流式服务器，支持更多功能"""
     
-    def __init__(self, port: int = 8000, bind_address: str = "0.0.0.0", 
-                 max_chunk_size: int = 1024 * 256):  # 256KB
+    def __init__(self, port: int = 8000, bind_address: str = "0.0.0.0", max_chunk_size: int = 1024 * 256):  # 256KB
         """
         初始化高级流式服务器
         
diff --git a/ui/main_window.py b/ui/main_window.py
index 76792cc..e3e49ec 100644
--- a/ui/main_window.py
+++ b/ui/main_window.py
@@ -140,11 +140,6 @@ class MainWindow(QMainWindow):
                 color: white;
                 background-color: #6c757d;
             }
-            QPushButton:disabled {
-                color: #999;
-                background-color: #f5f5f5;
-            }
-
             /* 特殊按钮样式 */
             #browseBtn{
                 background:white;
@@ -175,6 +170,14 @@ class MainWindow(QMainWindow):
                 color: white;
                 border: none;
             }
+            #startCastBtn:disabled, 
+            #pauseCastBtn:disabled,
+            #stopCastBtn:disabled{
+                color: #999 !important;
+                background-color: #f5f5f5 !important;
+            }
+            
+            
             /*音量图标*/
             #muteBtn{
                 background-color:none;
@@ -297,7 +300,7 @@ class MainWindow(QMainWindow):
 
         # 设备列表标题和刷新按钮
         device_header = QHBoxLayout()
-        device_header.addWidget(QLabel("可用设备列表:"))
+        device_header.addWidget(QLabel("设备列表(单击选中):"))
         device_header.addStretch()
         device_layout.addLayout(device_header)
 
@@ -322,6 +325,7 @@ class MainWindow(QMainWindow):
         self.start_btn = QPushButton("开始投屏")
         self.start_btn.setObjectName("startCastBtn")
         self.start_btn.setCursor(Qt.PointingHandCursor)
+        self.start_btn.setEnabled(False)
         self.start_btn.clicked.connect(self.start_casting)
 
         self.pause_btn = QPushButton("暂停投屏")
@@ -360,6 +364,7 @@ class MainWindow(QMainWindow):
         self.mute_btn.setCheckable(True)
         self.mute_btn.setFixedWidth(40)
         self.mute_btn.setObjectName("muteBtn")
+        self.mute_btn.setCursor(Qt.PointingHandCursor)
         self.mute_btn.clicked.connect(self.toggle_mute)
         volume_layout.addWidget(self.mute_btn)
 
@@ -648,6 +653,7 @@ class MainWindow(QMainWindow):
             self.log_message("设备选择", f"已选择设备: {device.get('friendly_name', '未知')}")
 
             # 启用控制按钮
+            self.start_btn.setText("开始投屏")
             self.enable_control_buttons(True)
 
     def browse_file(self):
@@ -673,7 +679,7 @@ class MainWindow(QMainWindow):
                 file_name = os.path.basename(self.selected_file)
                 self.file_label.setText(file_name)
                 #选择文件后启用播放按钮
-                self.start_btn.setEnabled(True)
+                self.enable_control_buttons(True)
                 self.log_message("文件选择", f"已选择文件: {file_name}")
 
     def start_casting(self):
@@ -730,6 +736,8 @@ class MainWindow(QMainWindow):
                     # 需要重新设置URI
                     file_name = os.path.basename(self.selected_file)
                     ip_text = self.ip_label.text()
+                    dir_bool = self.http_server.set_root_directory(self.selected_file)
+                    self.log_message("设置服务路径", "成功" if dir_bool else "失败")
                     file_url = f"http://{ip_text}/{file_name}"
 
                     if self.dlna_controller.set_av_transport_uri(file_url):
@@ -753,7 +761,7 @@ class MainWindow(QMainWindow):
             if self.dlna_controller.pause():
                 self.is_paused = True  # 标记为暂停状态
 
-                self.start_btn.setText("▶ 继续播放")
+                self.start_btn.setText("继续播放")
                 self.start_btn.setEnabled(True)
                 self.pause_btn.setEnabled(False)
 
@@ -765,7 +773,7 @@ class MainWindow(QMainWindow):
             if self.dlna_controller.stop():
                 self.is_paused = False  # 重置暂停状态
 
-                self.start_btn.setText("▶ 开始投屏")
+                self.start_btn.setText("开始投屏")
                 self.start_btn.setEnabled(True)
                 self.pause_btn.setEnabled(False)
                 self.stop_btn.setEnabled(False)
@@ -819,10 +827,12 @@ class MainWindow(QMainWindow):
 
     def enable_control_buttons(self, enabled):
         """启用/禁用控制按钮"""
-        self.pause_btn.setEnabled(False)
-        self.stop_btn.setEnabled(False)
-        self.volume_slider.setEnabled(enabled)
-        self.mute_btn.setEnabled(enabled)
+        if self.selected_device and self.selected_file:
+            self.start_btn.setEnabled(True)
+            self.pause_btn.setEnabled(False)
+            self.stop_btn.setEnabled(False)
+            self.volume_slider.setEnabled(enabled)
+            self.mute_btn.setEnabled(enabled)
 
     def closeEvent(self, event):
         """窗口关闭事件"""