diff --git a/common/log.py b/common/log.py
index f10eff9..14c7eff 100644
--- a/common/log.py
+++ b/common/log.py
@@ -2,9 +2,13 @@ import logging
 import sys
 
 
-def _get_logger():
-    log = logging.getLogger('log')
-    log.setLevel(logging.INFO)
+def _reset_logger(log):
+    for handler in log.handlers:
+        handler.close()
+        log.removeHandler(handler)
+        del handler
+    log.handlers.clear()
+    log.propagate = False
     console_handle = logging.StreamHandler(sys.stdout)
     console_handle.setFormatter(logging.Formatter('[%(levelname)s][%(asctime)s][%(filename)s:%(lineno)d] - %(message)s',
                                                   datefmt='%Y-%m-%d %H:%M:%S'))
@@ -13,6 +17,11 @@ def _get_logger():
                                                   datefmt='%Y-%m-%d %H:%M:%S'))
     log.addHandler(file_handle)
     log.addHandler(console_handle)
+
+def _get_logger():
+    log = logging.getLogger('log')
+    _reset_logger(log)
+    log.setLevel(logging.INFO)
     return log
 
 
diff --git a/common/package_manager.py b/common/package_manager.py
index da9b982..9370298 100644
--- a/common/package_manager.py
+++ b/common/package_manager.py
@@ -1,11 +1,14 @@
 import time
 import pip
+from pip._internal import main as pipmain
+from common.log import logger,_reset_logger
 
 def install(package):
-    pip.main(['install', package])
+    pipmain(['install', package])
 
 def install_requirements(file):
-    pip.main(['install', '-r', file, "--upgrade"])
+    pipmain(['install', '-r', file, "--upgrade"])
+    _reset_logger(logger)
 
 def check_dulwich():
     needwait = False
diff --git a/plugins/godcmd/godcmd.py b/plugins/godcmd/godcmd.py
index d294fb3..73439df 100644
--- a/plugins/godcmd/godcmd.py
+++ b/plugins/godcmd/godcmd.py
@@ -2,6 +2,8 @@
 
 import json
 import os
+import random
+import string
 import traceback
 from typing import Tuple
 from bridge.bridge import Bridge
@@ -158,7 +160,11 @@ class Godcmd(Plugin):
         else:
             with open(config_path,"r") as f:
                 gconf=json.load(f)
-        
+        if gconf["password"] == "":
+            self.temp_password = "".join(random.sample(string.digits, 4))
+            logger.info("[Godcmd] 因未设置口令，本次的临时口令为%s。"%self.temp_password)
+        else:
+            self.temp_password = None
         custom_commands = conf().get("clear_memory_commands", [])
         for custom_command in custom_commands:
             if custom_command and custom_command.startswith("#"):
@@ -167,7 +173,7 @@ class Godcmd(Plugin):
                     COMMANDS["reset"]["alias"].append(custom_command)
 
         self.password = gconf["password"]
-        self.admin_users = gconf["admin_users"] # 预存的管理员账号，这些账号不需要认证 TODO: 用户名每次都会变，目前不可用
+        self.admin_users = gconf["admin_users"] # 预存的管理员账号，这些账号不需要认证。itchat的用户名每次都会变，不可用
         self.isrunning = True # 机器人是否运行中
 
         self.handlers[Event.ON_HANDLE_CONTEXT] = self.on_handle_context
@@ -358,9 +364,6 @@ class Godcmd(Plugin):
         if isadmin:
             return False,"管理员账号无需认证"
         
-        if len(self.password) == 0:
-            return False,"未设置口令，无法认证"
-        
         if len(args) != 1:
             return False,"请提供口令"
         
@@ -368,6 +371,9 @@ class Godcmd(Plugin):
         if password == self.password:
             self.admin_users.append(userid)
             return True,"认证成功"
+        elif password == self.temp_password:
+            self.admin_users.append(userid)
+            return True,"认证成功，请尽快设置口令"
         else:
             return False,"认证失败"
 
diff --git a/plugins/plugin_manager.py b/plugins/plugin_manager.py
index a2b2bc8..9856e34 100644
--- a/plugins/plugin_manager.py
+++ b/plugins/plugin_manager.py
@@ -238,7 +238,7 @@ class PluginManager:
             if os.path.exists(os.path.join(dirname,"requirements.txt")):
                 logger.info("detect requirements.txt，installing...")
             pkgmgr.install_requirements(os.path.join(dirname,"requirements.txt"))
-            return True, "安装插件成功，请扫描插件或重启程序"
+            return True, "安装插件成功，请使用#scanp命令扫描插件或重启程序"
         except Exception as e:
             logger.error("Failed to install plugin, {}".format(e))
             return False, "安装插件失败，"+str(e)
@@ -254,6 +254,9 @@ class PluginManager:
             import shutil
             shutil.rmtree(dirname)
             rawname = self.plugins[name].name
+            for event in self.listening_plugins:
+                if name in self.listening_plugins[event]:
+                    self.listening_plugins[event].remove(name)
             del self.plugins[name]
             del self.pconf["plugins"][rawname]
             self.loaded[dirname] = None