diff --git a/none/__init__.py b/none/__init__.py
index 53052b80..1a27bc12 100644
--- a/none/__init__.py
+++ b/none/__init__.py
@@ -8,19 +8,24 @@ from typing import Any
 from aiocqhttp import CQHttp
 from aiocqhttp.message import Message
 
+from . import default_config
 from .log import logger
-from .message import handle_message
-from .notice_request import handle_notice_or_request
 
 
-def create_bot(config_object: Any = None) -> CQHttp:
+class NoneBot(CQHttp):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.config = default_config
+
+
+def create_bot(config_object: Any = None) -> NoneBot:
     if config_object is None:
-        from . import default_config as config_object
+        config_object = default_config
 
     kwargs = {k.lower(): v for k, v in config_object.__dict__.items()
               if k.isupper() and not k.startswith('_')}
 
-    bot = CQHttp(message_class=Message, **kwargs)
+    bot = NoneBot(message_class=Message, **kwargs)
     bot.config = config_object
     if bot.config.DEBUG:
         logger.setLevel(logging.DEBUG)
@@ -28,6 +33,9 @@ def create_bot(config_object: Any = None) -> CQHttp:
         logger.setLevel(logging.INFO)
     bot.asgi.debug = bot.config.DEBUG
 
+    from .message import handle_message
+    from .notice_request import handle_notice_or_request
+
     @bot.on_message
     async def _(ctx):
         asyncio.ensure_future(handle_message(bot, ctx))
diff --git a/none/command.py b/none/command.py
index de96b644..6929025e 100644
--- a/none/command.py
+++ b/none/command.py
@@ -5,10 +5,9 @@ from typing import (
     Tuple, Union, Callable, Iterable, Dict, Any, Optional, Sequence
 )
 
-from aiocqhttp import CQHttp
 from aiocqhttp.message import Message
 
-from . import permission as perm
+from . import NoneBot, permission as perm
 from .expression import render
 from .helpers import context_id
 from .session import BaseSession
@@ -159,7 +158,7 @@ class CommandSession(BaseSession):
     __slots__ = ('cmd', 'current_key', 'current_arg', 'current_arg_text',
                  'current_arg_images', 'args', 'last_interaction')
 
-    def __init__(self, bot: CQHttp, ctx: Dict[str, Any], cmd: Command, *,
+    def __init__(self, bot: NoneBot, ctx: Dict[str, Any], cmd: Command, *,
                  current_arg: str = '', args: Optional[Dict[str, Any]] = None):
         super().__init__(bot, ctx)
         self.cmd = cmd  # Command object
@@ -227,7 +226,7 @@ class CommandSession(BaseSession):
         return self.args.get(key, default)
 
 
-def _new_command_session(bot: CQHttp,
+def _new_command_session(bot: NoneBot,
                          ctx: Dict[str, Any]) -> Optional[CommandSession]:
     """
     Create a new session for a command.
@@ -236,7 +235,7 @@ def _new_command_session(bot: CQHttp,
     and if succeeded, it then create a session for the command and return.
     If the message is not a valid command, None will be returned.
 
-    :param bot: CQHttp instance
+    :param bot: NoneBot instance
     :param ctx: message context
     :return: CommandSession object or None
     """
@@ -299,13 +298,13 @@ def _new_command_session(bot: CQHttp,
     return CommandSession(bot, ctx, cmd, current_arg=''.join(cmd_remained))
 
 
-async def handle_command(bot: CQHttp, ctx: Dict[str, Any]) -> bool:
+async def handle_command(bot: NoneBot, ctx: Dict[str, Any]) -> bool:
     """
     Handle a message as a command.
 
     This function is typically called by "handle_message".
 
-    :param bot: CQHttp instance
+    :param bot: NoneBot instance
     :param ctx: message context
     :return: the message is handled as a command
     """
@@ -329,7 +328,7 @@ async def handle_command(bot: CQHttp, ctx: Dict[str, Any]) -> bool:
     return await _real_run_command(session, ctx_id, check_perm=check_perm)
 
 
-async def call_command(bot: CQHttp, ctx: Dict[str, Any],
+async def call_command(bot: NoneBot, ctx: Dict[str, Any],
                        name: Union[str, Tuple[str]],
                        args: Dict[str, Any]) -> bool:
     """
@@ -342,7 +341,7 @@ async def call_command(bot: CQHttp, ctx: Dict[str, Any],
     will be overridden, even if the command being called here does
     not need further interaction (a.k.a asking the user for more info).
 
-    :param bot: CQHttp instance
+    :param bot: NoneBot instance
     :param ctx: message context
     :param name: command name
     :param args: command args
diff --git a/none/helpers.py b/none/helpers.py
index f27ee857..38179a20 100644
--- a/none/helpers.py
+++ b/none/helpers.py
@@ -1,8 +1,8 @@
 from typing import Dict, Any, Union, List, Sequence, Callable
 
-from aiocqhttp import CQHttp, Error as CQHttpError
+from aiocqhttp import Error as CQHttpError
 
-from . import expression
+from . import NoneBot, expression
 
 
 def context_id(ctx: Dict[str, Any]) -> str:
@@ -19,7 +19,7 @@ def context_id(ctx: Dict[str, Any]) -> str:
     return src
 
 
-async def send(bot: CQHttp, ctx: Dict[str, Any],
+async def send(bot: NoneBot, ctx: Dict[str, Any],
                message: Union[str, Dict[str, Any], List[Dict[str, Any]]],
                *, ignore_failure: bool = True) -> None:
     """
@@ -43,7 +43,7 @@ async def send(bot: CQHttp, ctx: Dict[str, Any],
             raise
 
 
-async def send_expr(bot: CQHttp, ctx: Dict[str, Any],
+async def send_expr(bot: NoneBot, ctx: Dict[str, Any],
                     expr: Union[str, Sequence[str], Callable],
                     **kwargs):
     """
diff --git a/none/message.py b/none/message.py
index a712176e..ba3eda17 100644
--- a/none/message.py
+++ b/none/message.py
@@ -1,14 +1,14 @@
 from typing import Dict, Any
 
-from aiocqhttp import CQHttp
 from aiocqhttp.message import MessageSegment
 
+from . import NoneBot
 from .command import handle_command
 from .log import logger
 from .natural_language import handle_natural_language
 
 
-async def handle_message(bot: CQHttp, ctx: Dict[str, Any]) -> None:
+async def handle_message(bot: NoneBot, ctx: Dict[str, Any]) -> None:
     if ctx['message_type'] != 'private':
         # group or discuss
         ctx['to_me'] = False
diff --git a/none/natural_language.py b/none/natural_language.py
index 8c0b3332..dc2d7fa6 100644
--- a/none/natural_language.py
+++ b/none/natural_language.py
@@ -3,10 +3,9 @@ import re
 from collections import namedtuple
 from typing import Dict, Any, Iterable, Optional, Callable, Union
 
-from aiocqhttp import CQHttp
 from aiocqhttp.message import Message
 
-from . import permission as perm
+from . import NoneBot, permission as perm
 from .command import call_command
 from .log import logger
 from .session import BaseSession
@@ -53,7 +52,7 @@ def on_natural_language(keywords: Union[Optional[Iterable], Callable] = None,
 class NLPSession(BaseSession):
     __slots__ = ('msg', 'msg_text', 'msg_images')
 
-    def __init__(self, bot: CQHttp, ctx: Dict[str, Any], msg: str):
+    def __init__(self, bot: NoneBot, ctx: Dict[str, Any], msg: str):
         super().__init__(bot, ctx)
         self.msg = msg
         tmp_msg = Message(msg)
@@ -69,13 +68,13 @@ NLPResult = namedtuple('NLPResult', (
 ))
 
 
-async def handle_natural_language(bot: CQHttp, ctx: Dict[str, Any]) -> bool:
+async def handle_natural_language(bot: NoneBot, ctx: Dict[str, Any]) -> bool:
     """
     Handle a message as natural language.
 
     This function is typically called by "handle_message".
 
-    :param bot: CQHttp instance
+    :param bot: NoneBot instance
     :param ctx: message context
     :return: the message is handled as natural language
     """
diff --git a/none/notice_request.py b/none/notice_request.py
index f0e1da1e..db239978 100644
--- a/none/notice_request.py
+++ b/none/notice_request.py
@@ -1,8 +1,9 @@
 from typing import Dict, Any, Optional, Callable, Union
 
-from aiocqhttp import CQHttp, Error as CQHttpError
+from aiocqhttp import Error as CQHttpError
 from aiocqhttp.bus import EventBus
 
+from . import NoneBot
 from .log import logger
 from .session import BaseSession
 
@@ -34,14 +35,14 @@ on_request = _make_event_deco('request')
 class NoticeSession(BaseSession):
     __slots__ = ()
 
-    def __init__(self, bot: CQHttp, ctx: Dict[str, Any]):
+    def __init__(self, bot: NoneBot, ctx: Dict[str, Any]):
         super().__init__(bot, ctx)
 
 
 class RequestSession(BaseSession):
     __slots__ = ()
 
-    def __init__(self, bot: CQHttp, ctx: Dict[str, Any]):
+    def __init__(self, bot: NoneBot, ctx: Dict[str, Any]):
         super().__init__(bot, ctx)
 
     async def approve(self, remark: str = ''):
@@ -67,7 +68,7 @@ class RequestSession(BaseSession):
             pass
 
 
-async def handle_notice_or_request(bot: CQHttp, ctx: Dict[str, Any]) -> None:
+async def handle_notice_or_request(bot: NoneBot, ctx: Dict[str, Any]) -> None:
     post_type = ctx['post_type']  # "notice" or "request"
     detail_type = ctx[f'{post_type}_type']
     event = f'{post_type}.{detail_type}'
diff --git a/none/permission.py b/none/permission.py
index 36984e23..c70df552 100644
--- a/none/permission.py
+++ b/none/permission.py
@@ -2,7 +2,9 @@ from collections import namedtuple
 from typing import Dict, Any
 
 from aiocache import cached
-from aiocqhttp import CQHttp, Error as CQHttpError
+from aiocqhttp import Error as CQHttpError
+
+from . import NoneBot
 
 PRIVATE_FRIEND = 0x0001
 PRIVATE_GROUP = 0x0002
@@ -42,12 +44,12 @@ _min_context_fields = (
 _MinContext = namedtuple('MinContext', _min_context_fields)
 
 
-async def check_permission(bot: CQHttp, ctx: Dict[str, Any],
+async def check_permission(bot: NoneBot, ctx: Dict[str, Any],
                            permission_required: int) -> bool:
     """
     Check if the context has the permission required.
 
-    :param bot: CQHttp instance
+    :param bot: NoneBot instance
     :param ctx: message context
     :param permission_required: permission required
     :return: the context has the permission
@@ -63,7 +65,7 @@ async def check_permission(bot: CQHttp, ctx: Dict[str, Any],
 
 
 @cached(ttl=2 * 60)  # cache the result for 2 minute
-async def _check(bot: CQHttp, min_ctx: _MinContext,
+async def _check(bot: NoneBot, min_ctx: _MinContext,
                  permission_required: int) -> bool:
     permission = 0
     if min_ctx.user_id in bot.config.SUPERUSERS:
diff --git a/none/session.py b/none/session.py
index 9a3b5195..156cf963 100644
--- a/none/session.py
+++ b/none/session.py
@@ -1,14 +1,13 @@
 from typing import Union, Callable, Dict, Any, List, Sequence
 
-from aiocqhttp import CQHttp
-
+from . import NoneBot
 from .helpers import send, send_expr
 
 
 class BaseSession:
     __slots__ = ('bot', 'ctx')
 
-    def __init__(self, bot: CQHttp, ctx: Dict[str, Any]):
+    def __init__(self, bot: NoneBot, ctx: Dict[str, Any]):
         self.bot = bot
         self.ctx = ctx