diff --git a/nonebot/plugin.py b/nonebot/plugin.py
index 4936dc8e..d3db0631 100644
--- a/nonebot/plugin.py
+++ b/nonebot/plugin.py
@@ -139,8 +139,8 @@ def on_endswith(msg: str,
 
 
 def on_command(cmd: Union[str, Tuple[str, ...]],
-               alias: Set[Union[str, Tuple[str, ...]]] = None,
                rule: Optional[Union[Rule, RuleChecker]] = None,
+               aliases: Set[Union[str, Tuple[str, ...]]] = None,
                **kwargs) -> Union[Type[Matcher], MatcherGroup]:
     if isinstance(cmd, str):
         cmd = (cmd,)
@@ -153,14 +153,14 @@ def on_command(cmd: Union[str, Tuple[str, ...]],
     handlers = kwargs.pop("handlers", [])
     handlers.insert(0, _strip_cmd)
 
-    if alias:
-        alias = set(map(lambda x: (x,) if isinstance(x, str) else x, alias))
+    if aliases:
+        aliases = set(map(lambda x: (x,) if isinstance(x, str) else x, aliases))
         group = MatcherGroup("message",
                              Rule() & rule,
                              handlers=handlers,
                              **kwargs)
-        for cmd_ in [cmd, *alias]:
-            group.new(rule=command(cmd_))
+        for cmd_ in [cmd, *aliases]:
+            _tmp_matchers.add(group.new(rule=command(cmd_)))
         return group
     else:
         return on_message(command(cmd) & rule, handlers=handlers, **
diff --git a/tests/test_plugins/test_group/__init__.py b/tests/test_plugins/test_group/__init__.py
new file mode 100644
index 00000000..1f47bd5c
--- /dev/null
+++ b/tests/test_plugins/test_group/__init__.py
@@ -0,0 +1,6 @@
+from nonebot.rule import to_me
+from nonebot import CommandGroup
+
+test = CommandGroup("test", rule=to_me())
+
+from . import commands
diff --git a/tests/test_plugins/test_group/commands.py b/tests/test_plugins/test_group/commands.py
new file mode 100644
index 00000000..e825329d
--- /dev/null
+++ b/tests/test_plugins/test_group/commands.py
@@ -0,0 +1,11 @@
+from nonebot.typing import Bot, Event
+from nonebot.permission import GROUP_OWNER
+
+from . import test
+
+test_1 = test.command("1", aliases={"test"}, permission=GROUP_OWNER)
+
+
+@test_1.handle()
+async def test1(bot: Bot, event: Event, state: dict):
+    await test_1.finish(event.raw_message)
diff --git a/tests/test_plugins/test_message.py b/tests/test_plugins/test_message.py
deleted file mode 100644
index e683b630..00000000
--- a/tests/test_plugins/test_message.py
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-
-from nonebot.rule import to_me
-from nonebot.typing import Event
-from nonebot.plugin import on_message
-from nonebot.adapters.cqhttp import Bot
-
-test_message = on_message(to_me(), state={"default": 1})
-
-
-@test_message.handle()
-async def test_handler(bot: Bot, event: Event, state: dict):
-    print("[*] Test Matcher Received:", event)
-    state["event"] = event
-    await bot.send(message="Received", event=event)
-
-
-@test_message.receive()
-async def test_receive(bot: Bot, event: Event, state: dict):
-    print("[*] Test Matcher Received next time:", event)
-    print("[*] Current State:", state)