diff --git a/receiver_ui.py b/receiver_ui.py
index e84da52..e7eb417 100644
--- a/receiver_ui.py
+++ b/receiver_ui.py
@@ -36,6 +36,9 @@ class Ui_MainWindow(object):
         self.textBrowser = QtWidgets.QTextBrowser(self.centralwidget)
         self.textBrowser.setGeometry(QtCore.QRect(10, 10, 541, 501))
         self.textBrowser.setObjectName("textBrowser")
+			self.connect_button = QtWidgets.QPushButton(self.centralwidget)
+        self.connect_button.setGeometry(QtCore.QRect(560, 60, 121, 51))
+        self.connect_button.setObjectName("connect_button")
         self.receive_button = QtWidgets.QPushButton(self.centralwidget)
         self.receive_button.setGeometry(QtCore.QRect(560, 110, 121, 51))
         self.receive_button.setObjectName("receive_button")
@@ -95,18 +98,28 @@ class Ui_MainWindow(object):
         self.receive_button.clicked.connect(self.receive) # type: ignore
         self.decrypt_button.clicked.connect(self.decrypt) # type: ignore
         self.verify_button.clicked.connect(self.verify) # type: ignore
+        self.connect_button.clicked.connect(self.connect) # type: ignore
         QtCore.QMetaObject.connectSlotsByName(MainWindow)
     def retranslateUi(self, MainWindow):
         _translate = QtCore.QCoreApplication.translate
         MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
+			self.connect_button.setText(_translate("MainWindow", "连接发送端"))
         self.receive_button.setText(_translate("MainWindow", "接收文件"))
         self.decrypt_button.setText(_translate("MainWindow", "解密"))
         self.verify_button.setText(_translate("MainWindow", "验证签名"))
+	# 连接发送端 准备接收数据
+    def connect(self):
+        self.receiver_conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.receiver_conn.connect(('localhost', 8888))
+        QMessageBox.information(QMainWindow(), '提示', "已连接到服务端")        
+        self.client = self.receiver_conn	# 继承连接实例
+	
+    # 接收信封并解封保存，加密后的对称密钥，密文，签名
     def receive(self):
         #接收信封并解封保存，加密后的对称密钥，密文，签名
         # data = b""
         # while True:
-        #     sender_socket,addr = self.receiver.accept()
+        #     sender_socket,addr = self.client.accept()
         #     while True:
         #         envelope_dict = sender_socket.recv(1024)
         #         if not envelope_dict:
@@ -206,10 +219,6 @@ if  __name__ == "__main__":
     app = QtWidgets.QApplication(sys.argv)
     window = QtWidgets.QMainWindow()
     ui = Ui_MainWindow()
-    #接收方建立连接 等待发送方连接
-    receiver_conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    receiver_conn.bind(('localhost', 8888))
-    receiver_conn.listen(5)
     ui.setupUi(window,receiver_conn)
     window.show()
     sys.exit(app.exec_())
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