diff --git a/wxpy/__init__.py b/wxpy/__init__.py
index 38f795c..3a6f4e6 100644
--- a/wxpy/__init__.py
+++ b/wxpy/__init__.py
@@ -54,7 +54,7 @@ def reply_my_friend(msg):
 from .utils import dont_raise_response_error, embed, ensure_one, mutual_friends
 
 __title__ = 'wxpy'
-__version__ = '0.3.3'
+__version__ = '0.3.4'
 __author__ = 'Youfou'
 __license__ = 'MIT'
 __copyright__ = '2017, Youfou'
diff --git a/wxpy/api/bot.py b/wxpy/api/bot.py
index 46ee16c..22f8a17 100644
--- a/wxpy/api/bot.py
+++ b/wxpy/api/bot.py
@@ -10,8 +10,7 @@
 import itchat
 
 from wxpy.api.chats import Chat, Chats, Friend, Group, MP, User
-from wxpy.api.messages import Message, MessageConfig, Messages, Registered
-from wxpy.api.messages import SYSTEM
+from wxpy.api.messages import Message, MessageConfig, Messages, Registered, SYSTEM
 from wxpy.utils import enhance_connection, ensure_list, get_user_name, handle_response, wrap_user_name
 
 logger = logging.getLogger(__name__)
@@ -64,7 +63,7 @@ def __init__(
         self.self = Friend(self.core.loginInfo['User'], self)
         self.file_helper = Chat(wrap_user_name('filehelper'), self)
 
-        self.messages = Messages(bot=self)
+        self.messages = Messages()
         self.registered = Registered(self)
 
         self.is_listening = False
diff --git a/wxpy/api/chats/chat.py b/wxpy/api/chats/chat.py
index 1caf856..9828857 100644
--- a/wxpy/api/chats/chat.py
+++ b/wxpy/api/chats/chat.py
@@ -203,7 +203,7 @@ def get_avatar(self, save_path=None):
         else:
             raise TypeError('expected `Friend`, `Group` or `Member`, got`{}`'.format(type(self)))
 
-        kwargs.update(picDir=save_path)
+        kwargs.update(dict(picDir=save_path))
 
         return self.bot.core.get_head_img(**kwargs)
 
diff --git a/wxpy/api/chats/group.py b/wxpy/api/chats/group.py
index fcddd74..7f1ba28 100644
--- a/wxpy/api/chats/group.py
+++ b/wxpy/api/chats/group.py
@@ -28,8 +28,10 @@ def raw_member_list(update=False):
             return self.raw.get('MemberList', list())
 
         ret = Chats(source=self)
-        for raw in raw_member_list() or raw_member_list(True):
-            ret.append(Member(raw, self))
+        ret.extend(map(
+            lambda x: Member(x, self),
+            raw_member_list() or raw_member_list(True)
+        ))
         return ret
 
     def __contains__(self, user):
diff --git a/wxpy/api/chats/member.py b/wxpy/api/chats/member.py
index 31acf08..9556601 100644
--- a/wxpy/api/chats/member.py
+++ b/wxpy/api/chats/member.py
@@ -1,4 +1,5 @@
 from .user import User
+import weakref
 
 
 # Todo: 若尝试获取群成员信息时为空，自动更新成员信息 (并要照顾到遍历所有群成员的场景)
@@ -11,7 +12,7 @@ class Member(User):
 
     def __init__(self, raw, group):
         super(Member, self).__init__(raw, group.bot)
-        self.group = group
+        self.group = weakref.proxy(group)
 
     @property
     def display_name(self):
diff --git a/wxpy/api/messages/message.py b/wxpy/api/messages/message.py
index 6c91844..a62c8bf 100644
--- a/wxpy/api/messages/message.py
+++ b/wxpy/api/messages/message.py
@@ -1,6 +1,7 @@
 import html
 import os
 import tempfile
+import weakref
 from datetime import datetime
 from xml.etree import ElementTree as ETree
 
@@ -39,7 +40,7 @@ class Message(object):
     def __init__(self, raw, bot):
         self.raw = raw
 
-        self.bot = bot
+        self.bot = weakref.proxy(bot)
         self.type = self.raw.get('Type')
 
         self.is_at = self.raw.get('IsAt') or self.raw.get('isAt')
diff --git a/wxpy/api/messages/message_config.py b/wxpy/api/messages/message_config.py
index 4eacc19..5a6c406 100644
--- a/wxpy/api/messages/message_config.py
+++ b/wxpy/api/messages/message_config.py
@@ -1,4 +1,5 @@
 import logging
+import weakref
 
 from wxpy.utils import ensure_list
 
@@ -15,7 +16,7 @@ def __init__(
             chats, msg_types, except_self,
             run_async, enabled
     ):
-        self.bot = bot
+        self.bot = weakref.proxy(bot)
         self.func = func
 
         self.chats = ensure_list(chats)
diff --git a/wxpy/api/messages/messages.py b/wxpy/api/messages/messages.py
index 0007412..4d5ef36 100644
--- a/wxpy/api/messages/messages.py
+++ b/wxpy/api/messages/messages.py
@@ -6,10 +6,9 @@ class Messages(list):
     多条消息的合集，可用于记录或搜索
     """
 
-    def __init__(self, msg_list=None, bot=None, max_history=None):
+    def __init__(self, msg_list=None, max_history=None):
         if msg_list:
             super(Messages, self).__init__(msg_list)
-        self.bot = bot
         self.max_history = max_history
 
     def append(self, msg):
@@ -33,4 +32,4 @@ def match(msg):
                 return
             return True
 
-        return Messages(filter(match, self), bot=self.bot, max_history=self.max_history)
+        return Messages(filter(match, self), max_history=self.max_history)
diff --git a/wxpy/api/messages/registered.py b/wxpy/api/messages/registered.py
index be248e4..9923b21 100644
--- a/wxpy/api/messages/registered.py
+++ b/wxpy/api/messages/registered.py
@@ -1,3 +1,5 @@
+import weakref
+
 from .message import SYSTEM
 
 
@@ -9,7 +11,7 @@ def __init__(self, bot):
         :param bot: 所属的机器人
         """
         super(Registered, self).__init__()
-        self.bot = bot
+        self.bot = weakref.proxy(bot)
 
     def get_config(self, msg):
         """
diff --git a/wxpy/utils/misc.py b/wxpy/utils/misc.py
index b8040f7..67e3dee 100644
--- a/wxpy/utils/misc.py
+++ b/wxpy/utils/misc.py
@@ -1,7 +1,7 @@
 import inspect
 import re
 from functools import wraps
-
+import weakref
 from requests.adapters import HTTPAdapter
 
 from wxpy.exceptions import ResponseError
@@ -48,7 +48,7 @@ def wrapped(*args, **kwargs):
 
             from wxpy.api.bot import Bot
             if isinstance(self, Bot):
-                bot = self
+                bot = weakref.proxy(self)
             else:
                 bot = getattr(self, 'bot', None)
                 if not bot: