diff --git a/PWFile.py b/PWFile.py
index 7c2fb0d..ba0dba9 100644
--- a/PWFile.py
+++ b/PWFile.py
@@ -1,6 +1,8 @@
 import os.path
 from collections import OrderedDict
 import re
+
+import attrs
 import pandas as pd
 from attrs import define
 from tkinter.messagebox import NO
@@ -509,6 +511,7 @@ class ContinuousPlate:
 
 @define
 class ControlFile:
+    _z_excel_file_path: bool = attrs.field(init=True, kw_only=False)
     _z_file_path: str = ""
     _dwg_file_path: str = ""
     _from_tower_name: str = ""
@@ -519,8 +522,11 @@ class ControlFile:
     _s_file_path: str = ""
     _dir_prefix: str = ""
     _z_file_name: str = ""
-
-    def __init__(self, z_excel_file_path):
+    _close_cad_document: bool = attrs.field(init=True, kw_only=False, default=True)
+    # def __init__(self, z_excel_file_path):
+    def __attrs_post_init__(self):
+        # self._close_cad_document=close_cad_document
+        z_excel_file_path = self._z_excel_file_path
         excel_pf = pd.read_excel(z_excel_file_path)
         pf_dict = excel_pf.to_dict("records")[0]
         z_excel_path = os.path.split(z_excel_file_path)
@@ -537,6 +543,9 @@ class ControlFile:
         self._dwg_file_path = os.path.join(dir_prefix, pf_dict["DWG文件"])
         self._s_file_path = os.path.join(dir_prefix, pf_dict["S文件"])
 
+    def get_zt_dwg_file_path(self):  # 获得生成的dwg文件名路径
+        return os.path.join(self._dir_prefix, "ZT" + self._z_file_name + ".dwg")
+
     def draw(self):
         continousePlate = ContinuousPlate(
             self._dwg_file_path,
@@ -555,7 +564,6 @@ class ControlFile:
         )
         string_impact_plate.draw()
         cad = continousePlate.cad
-        cad.doc.SaveAs(
-            os.path.join(self._dir_prefix, "ZT" + self._z_file_name + ".dwg")
-        )
-        cad.doc.Close(False)
+        cad.doc.SaveAs(self.get_zt_dwg_file_path())
+        if self._close_cad_document:
+            cad.doc.Close(False)
diff --git a/gui.py b/gui.py
index e45c7ad..0f6a692 100644
--- a/gui.py
+++ b/gui.py
@@ -1,3 +1,5 @@
+import os.path
+
 from ui.mainwindow import Ui_mainWindow
 
 from PyQt6 import QtWidgets
@@ -8,6 +10,16 @@ from PWFile import ControlFile
 
 
 class MainWindow(QMainWindow, Ui_mainWindow):
+    def _test_if_file_occupied(self, file_path):
+        if not os.path.exists(file_path):
+            return False
+        try:
+            with open(file_path, "wb") as file:
+                pass
+            return False
+        except PermissionError:
+            return True
+
     def open_dialog(self):
         z_control_file_paths = QFileDialog.getOpenFileNames(
             self,
@@ -17,7 +29,12 @@ class MainWindow(QMainWindow, Ui_mainWindow):
         )[0]
         for z_control_file_path in z_control_file_paths:
             if z_control_file_path != "":
-                cf = ControlFile(z_control_file_path)
+                cf = ControlFile(z_control_file_path,close_cad_document=False)
+                if self._test_if_file_occupied(cf.get_zt_dwg_file_path()):
+                    QMessageBox.warning(
+                        self, "注意", f"{cf.get_zt_dwg_file_path()}被占用，请先关闭。"
+                    )
+                    return
                 cf.draw()
                 self.statusBar().showMessage(
                     f"{datetime.datetime.now()}   Finished.", 8000