diff --git a/sender_ui.py b/sender_ui.py
index cdb0244..57b3c1f 100644
--- a/sender_ui.py
+++ b/sender_ui.py
@@ -12,7 +12,7 @@
 #
 from PyQt5 import QtCore, QtGui, QtWidgets
 import sys
-from PyQt5.QtWidgets import QFileDialog,QMainWindow
+from PyQt5.QtWidgets import QFileDialog,QMainWindow,QMessageBox
 from gmssl import sm4, func
 import json
 import socket
@@ -86,12 +86,15 @@ class Ui_MainWindow(object):
         self.mode=""
         self.algorithm=""
         self.encrypted_text=""
+        QMessageBox.information(MainWindow, "提示", "请选择自己的公钥")
         path = QFileDialog.getOpenFileName()[0]
         with open(path,"rb") as f:
             self.public_key=crypto.load_publickey(crypto.FILETYPE_PEM,f.read())
+        QMessageBox.information(MainWindow, "提示", "请选择自己的私钥")
         path = QFileDialog.getOpenFileName()[0]
         with open(path,"rb") as f:
             self.private_key=crypto.load_privatekey(crypto.FILETYPE_PEM,f.read())
+        QMessageBox.information(MainWindow, "提示", "请选择对方的公钥")
         path = QFileDialog.getOpenFileName()[0]
         with open(path,"rb") as f:
             self.public_key_other=crypto.load_publickey(crypto.FILETYPE_PEM,f.read())
@@ -138,7 +141,7 @@ class Ui_MainWindow(object):
                 text = text + (b'\0' * add)
                 encrypted_text = cryptor.encrypt(text)
                 self.encrypted_text = b2a_hex(encrypted_text).decode("utf-8")
-                self.textBrowser.append(encrypted_text+"\n")
+                self.textBrowser.append(encrypted_text.decode())
             elif self.mode=="CBC":
                 mode = AES.MODE_CBC
                 cryptor = AES.new(self.key, mode, self.key)#iv = self.key
@@ -149,7 +152,7 @@ class Ui_MainWindow(object):
                 text = text + (b'\0' * add)
                 encrypted_text = cryptor.encrypt(text)
                 self.encrypted_text = b2a_hex(encrypted_text).decode("utf-8")
-                self.textBrowser.append(encrypted_text+"\n")
+                self.textBrowser.append(encrypted_text.decode())
             else:
                 self.textBrowser.append("mode error")
         elif self.algorithm=="SM4":