diff --git a/requirements.txt b/requirements.txt
index aa21d58..ec019f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,2 @@
 opencv-python==4.8.1.78
-mediapipe==0.10.18
-PyQt6==6.6.1
-PyQt6-Qt6==6.6.1
-PyQt6-sip==13.6.0
\ No newline at end of file
+PyQt5==5.15.9
\ No newline at end of file
diff --git a/start.bat b/start.bat
index db9a98f..507e50d 100644
--- a/start.bat
+++ b/start.bat
@@ -15,8 +15,8 @@ python -m pip install --upgrade pip
 echo Installing requirements one by one...
 echo Installing OpenCV...
 python -m pip install opencv-python==4.8.1.78
-echo Installing PyQt6...
-python -m pip install PyQt6==6.6.1 PyQt6-Qt6==6.6.1 PyQt6-sip==13.6.0
+echo Installing PyQt5...
+python -m pip install PyQt5==5.15.9
 
 echo Starting application...
 python workspace_monitor.py
diff --git a/workspace_monitor.py b/workspace_monitor.py
index 3c1f711..5f4cbd3 100644
--- a/workspace_monitor.py
+++ b/workspace_monitor.py
@@ -6,11 +6,11 @@ import traceback
 import logging
 import os
 from datetime import datetime
-from PyQt6.QtWidgets import (QApplication, QMainWindow, QWidget, QVBoxLayout, 
+from PyQt5.QtWidgets import (QApplication, QMainWindow, QWidget, QVBoxLayout, 
                             QHBoxLayout, QPushButton, QLabel, QSpinBox, 
-                            QStyle, QProgressBar, QSystemTrayIcon, QMenu)
-from PyQt6.QtCore import Qt, QTimer
-from PyQt6.QtGui import QImage, QPixmap, QIcon, QFont
+                            QStyle, QProgressBar, QSystemTrayIcon, QMenu, QMessageBox)
+from PyQt5.QtCore import Qt, QTimer
+from PyQt5.QtGui import QImage, QPixmap, QIcon, QFont
 
 # 设置日志
 logging.basicConfig(
@@ -42,7 +42,7 @@ try:
                 
                 # 系统托盘
                 self.tray_icon = QSystemTrayIcon(self)
-                self.tray_icon.setIcon(self.style().standardIcon(QStyle.StandardPixmap.SP_ComputerIcon))
+                self.tray_icon.setIcon(self.style().standardIcon(QStyle.SP_ComputerIcon))
                 self.create_tray_menu()
                 self.tray_icon.show()
                 
@@ -79,8 +79,8 @@ try:
             
             # 标题
             title_label = QLabel("工位监控系统")
-            title_label.setFont(QFont('Arial', 16, QFont.Weight.Bold))
-            title_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
+            title_label.setFont(QFont('Arial', 16, QFont.Bold))
+            title_label.setAlignment(Qt.AlignCenter)
             main_layout.addWidget(title_label)
             
             # 摄像头预览
@@ -89,7 +89,7 @@ try:
             preview_layout = QVBoxLayout(preview_container)
             
             self.camera_label = QLabel()
-            self.camera_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
+            self.camera_label.setAlignment(Qt.AlignCenter)
             self.camera_label.setMinimumHeight(480)
             preview_layout.addWidget(self.camera_label)
             
@@ -206,7 +206,7 @@ try:
             self.tray_icon.activated.connect(self.tray_icon_activated)
             
         def tray_icon_activated(self, reason):
-            if reason == QSystemTrayIcon.ActivationReason.DoubleClick:
+            if reason == QSystemTrayIcon.DoubleClick:
                 self.show()
                 
         def update_frame(self):
@@ -271,7 +271,7 @@ try:
             
             if self.no_face_duration > self.timeout:
                 self.status_label.setText(f"状态: 锁定屏幕 - {datetime.now()}")
-                self.tray_icon.showMessage("工位监控", "系统即将锁定", QSystemTrayIcon.MessageIcon.Warning)
+                self.tray_icon.showMessage("工位监控", "系统即将锁定", QSystemTrayIcon.Warning)
                 self.lock_windows()
                 # 重置所有状态
                 self.last_face_time = time.time()
@@ -285,10 +285,10 @@ try:
             rgb_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
             h, w, ch = rgb_frame.shape
             bytes_per_line = ch * w
-            qt_image = QImage(rgb_frame.data, w, h, bytes_per_line, QImage.Format.Format_RGB888)
+            qt_image = QImage(rgb_frame.data, w, h, bytes_per_line, QImage.Format.RGB888)
             scaled_pixmap = QPixmap.fromImage(qt_image).scaled(
                 self.camera_label.size(), 
-                Qt.AspectRatioMode.KeepAspectRatio
+                Qt.KeepAspectRatio
             )
             self.camera_label.setPixmap(scaled_pixmap)
                 
@@ -306,6 +306,7 @@ try:
                 self.start_stop_btn.setStyleSheet("background-color: #ff4444;")
                 self.status_label.setText("状态: 正在监控")
                 self.timer.start(30)
+                self.tray_icon.showMessage("工位监控", "监控已开始", QSystemTrayIcon.Information)
                 self.tray_icon.showMessage("工位监控", "监控已开始", QSystemTrayIcon.MessageIcon.Information)
             else:
                 self.running = False