diff --git a/README.md b/README.md
index 63816ad..86ae1e0 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ class Foo:
         pass
 
 
-@Mixin(target=Foo)
+@Mixin(target = Foo)
 class MixinFoo:
     # Will add a varible named `__private` to Foo and it has the same address with `_Foo__private`
     private: Accessor[str] = Accessor("__private")
@@ -112,10 +112,10 @@ The default operations can't satify you? Why not try define a operation yourself
 ```python
 from typing import Any
 from saleyo import MixinOperation, ToolChain
-from saleyo.base.typing import MixinAble
+from saleyo.base.typing import M
 
-class MyOperation(MixinOperation[Any]):
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ...) -> None:
+class MyOperation(MixinOperation[Any, M]):
+    def mixin(self, target: M, toolchain: ToolChain = ...) -> None:
         ...
 ```
 
diff --git a/src/saleyo/base/template.py b/src/saleyo/base/template.py
index 7c3d90f..9bba89f 100644
--- a/src/saleyo/base/template.py
+++ b/src/saleyo/base/template.py
@@ -1,17 +1,19 @@
 from abc import ABC
-from typing import Generic
+from typing import Any, Generic
 
 from .toolchain import ToolChain
-from .typing import T, MixinAble
+from .typing import T, M
 
 
-class MixinOperation(Generic[T], ABC):
+class MixinOperation(Generic[T, M], ABC):
     """
     The MixinOperation is the base of All Operation.
 
     The generic `MixinOperation` is the type of argument.
 
-    `level` will affect to the mixin order, default to `1`.
+    `level` will affect to the mixin order, default `1`.
+    
+    If you call the `MixinOperation` or call the subclass of this, it will call the `MixinOperation.argument` 
     """
 
     argument: T
@@ -21,7 +23,9 @@ def __init__(self, argument: T, level=1) -> None:
         self.argument = argument
         self.level = level
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         raise NotImplementedError(
             f"Not Ready to use this Operation to modify '{target}' via '{toolchain}'"
         )
+
+    def __call__(self, *args: Any, **kwargs: Any) -> Any: ...
diff --git a/src/saleyo/base/typing.py b/src/saleyo/base/typing.py
index fd5383c..6c51af3 100644
--- a/src/saleyo/base/typing.py
+++ b/src/saleyo/base/typing.py
@@ -17,6 +17,14 @@
 `P` means `Params`
 """
 
+M = TypeVar("M", Type[Any], ModuleType, Any)
+"""
+These can be the target of mixin.
+
+Not recommend input Any.
+"""
+
+
 # Alias
 
 NameSpace = Dict[str, Any]
@@ -28,8 +36,3 @@
 """
 `IterableOrSingle[T]` is the alias of `Union[T, List[T]]` 
 """
-
-MixinAble = Union[Type[Any], ModuleType]
-"""
-These can be the target of mixin.
-"""
diff --git a/src/saleyo/mixin.py b/src/saleyo/mixin.py
index 4d3e546..806e3cd 100644
--- a/src/saleyo/mixin.py
+++ b/src/saleyo/mixin.py
@@ -1,11 +1,11 @@
-from typing import Iterable, List
+from typing import Generic, Iterable, List, Union
 
 from .base.template import MixinOperation
 from .base.toolchain import ToolChain
-from .base.typing import T, IterableOrSingle, MixinAble
+from .base.typing import M, T, IterableOrSingle
 
 
-class Mixin:
+class Mixin(Generic[M]):
     """
     A `Mixin` Decorator is used to invoke all the `MixinOperation` in Mixin Class.
 
@@ -14,13 +14,13 @@ class Mixin:
     Allow to have more than one target, but that's not recommended.
     """
 
-    target: Iterable[MixinAble]
+    target: Iterable[M]
     toolchain: ToolChain
     reverse_level: bool
 
     def __init__(
         self,
-        target: IterableOrSingle[MixinAble],
+        target: IterableOrSingle[M],
         toolchain: ToolChain = ToolChain(),
         reverse_level: bool = False,
     ) -> None:
@@ -139,5 +139,5 @@ def apply_from_operations(
             for target in self.target:
                 operation.mixin(target=target, toolchain=self.toolchain)
 
-    def __call__(self, mixin: T) -> T:
+    def __call__(self, mixin: T) -> Union[M, T]:
         return self.apply_from_class(mixin=mixin)
diff --git a/src/saleyo/operation/accessor.py b/src/saleyo/operation/accessor.py
index 032ded1..4985e52 100644
--- a/src/saleyo/operation/accessor.py
+++ b/src/saleyo/operation/accessor.py
@@ -1,11 +1,11 @@
 from typing import Generic, Optional
 
 from ..base.toolchain import ToolChain
-from ..base.typing import T, MixinAble
+from ..base.typing import T, M
 from ..base.template import MixinOperation
 
 
-class Accessor(Generic[T], MixinOperation[str]):
+class Accessor(Generic[T, M], MixinOperation[str, M]):
     """
     Want to access and modify some private varibles or methods? Try use `Accessor`!
 
@@ -34,7 +34,7 @@ def configure(level: int = 1):
             private=True,
         )
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         self._inner = toolchain.tool_getattr(
             target,
             f"_{target.__name__}{self.argument}" if self._private else self.argument,
diff --git a/src/saleyo/operation/ancestor.py b/src/saleyo/operation/ancestor.py
index b133554..099ff51 100644
--- a/src/saleyo/operation/ancestor.py
+++ b/src/saleyo/operation/ancestor.py
@@ -1,14 +1,15 @@
 from typing import Any, Type
 from saleyo.base.template import MixinOperation
 from saleyo.base.toolchain import ToolChain
+from saleyo.base.typing import M
 
 
-class Ancestor(MixinOperation[Type[Any]]):
+class Ancestor(MixinOperation[Type[Any], M]):
     """
     Ancestor will add the `argument` to `target.__bases__`.
-    
+
     If `reverse`, the `argument` will add to the head of `target.__bases__`.
-    
+
     Don't try to use it with external code and `module`, it may crash.
     """
 
diff --git a/src/saleyo/operation/hook.py b/src/saleyo/operation/hook.py
index b383066..b948b7f 100644
--- a/src/saleyo/operation/hook.py
+++ b/src/saleyo/operation/hook.py
@@ -1,11 +1,11 @@
 from typing import Any, Callable, Optional, Union
 
-from ..base.typing import P, RT, T, MixinAble
+from ..base.typing import M, P, RT, T
 from ..base.toolchain import ToolChain, Arguments
 from ..base.template import MixinOperation
 
 
-class Post(MixinOperation[Callable[[T], Optional[RT]]]):
+class Post(MixinOperation[Callable[[T], Optional[RT]], M]):
     """
     `Post` will call after the target method, and the callable should be decorated as `@staticmethod` and have one argument to receive the result of target method.
 
@@ -34,7 +34,7 @@ def configure(
             level=level,
         )
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         target_name = (
             self.target_name if self.target_name is not None else self.argument.__name__
         )
@@ -50,7 +50,7 @@ def post(*args, **kwargs) -> Union[T, RT]:
         return toolchain.tool_setattr(target, target_name, post)
 
 
-class Pre(MixinOperation[Callable[P, Optional[Arguments[P]]]]):
+class Pre(MixinOperation[Callable[P, Optional[Arguments[P]]], M]):
     """
     `Pre` will call before the target method, and the callable should be decorated as `@staticmethod` and have `*args,**kwargs` to receive the arguments of target method.
 
@@ -79,7 +79,7 @@ def configure(
             level=level,
         )
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         target_name = (
             self.target_name if self.target_name is not None else self.argument.__name__
         )
diff --git a/src/saleyo/operation/intercept.py b/src/saleyo/operation/intercept.py
index 907f914..3a6d3c4 100644
--- a/src/saleyo/operation/intercept.py
+++ b/src/saleyo/operation/intercept.py
@@ -1,4 +1,4 @@
-from ..base.typing import MixinAble
+from ..base.typing import M
 from ..base.toolchain import InvokeEvent, ToolChain
 from ..base.template import MixinOperation
 
@@ -10,7 +10,7 @@
 _B = InvokeEvent[_PB, Any]
 
 
-class Intercept(Generic[_PA, _PB], MixinOperation[Callable[[_A[_PA]], _B[_PB]]]):
+class Intercept(Generic[_PA, _PB, M], MixinOperation[Callable[[_A[_PA]], _B[_PB]], M]):
     """
     The `Intercept` allow you to intercept the arguments before invoking target method.
 
@@ -34,7 +34,7 @@ def __init__(
     def configure(
         level: int = 1,
         target_name: Optional[str] = None,
-    ) -> Callable[[Callable[[_A[_PA]], _B[_PB]]], "Intercept[_PA, _PB]"]:
+    ) -> Callable[[Callable[[_A[_PA]], _B[_PB]]], "Intercept[_PA, _PB, M]"]:
         return lambda argument: Intercept(
             argument=argument,
             level=level,
@@ -43,7 +43,7 @@ def configure(
 
     def mixin(
         self,
-        target: MixinAble,
+        target: M,
         toolchain: ToolChain = ToolChain(),
     ) -> None:
         target_name = (
diff --git a/src/saleyo/operation/modify.py b/src/saleyo/operation/modify.py
index 7b03d0e..92ec778 100644
--- a/src/saleyo/operation/modify.py
+++ b/src/saleyo/operation/modify.py
@@ -1,11 +1,11 @@
 from typing import Any
 
-from ..base.typing import MixinAble
+from ..base.typing import M
 from ..base.toolchain import ToolChain
 from ..base.template import MixinOperation
 
 
-class ReName(MixinOperation[str]):
+class ReName(MixinOperation[str, Any]):
     """
     Rename the target name.
     """
@@ -16,22 +16,22 @@ def __init__(self, old: str, new: str, level=1) -> None:
         super().__init__(old, level)
         self.new = new
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         old = toolchain.tool_getattr(target, self.argument)
         toolchain.tool_delattr(target, self.argument)
         return toolchain.tool_setattr(target, self.new, old)
 
 
-class Del(MixinOperation[str]):
+class Del(MixinOperation[str, M]):
     """
     Delete something named `argument` this from target
     """
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         return toolchain.tool_delattr(target, self.argument)
 
 
-class Alias(MixinOperation[str]):
+class Alias(MixinOperation[str, M]):
     """will copy the `argument` attribute to `alias`"""
 
     alias: str
@@ -40,12 +40,15 @@ def __init__(self, argument: str, alias: str, level=1) -> None:
         super().__init__(argument, level)
         self.alias = alias
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         return toolchain.tool_setattr(
             target, self.alias, toolchain.tool_getattr(target, self.argument)
         )
 
 
-class Insert(MixinOperation[Any]):
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+class Insert(MixinOperation[Any, M]):
+    """Will cover target when target exists."""
+
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         return toolchain.tool_setattr(target, self.argument.__name__, self.argument)
+
diff --git a/src/saleyo/operation/overwrite.py b/src/saleyo/operation/overwrite.py
index 319d690..db85dbe 100644
--- a/src/saleyo/operation/overwrite.py
+++ b/src/saleyo/operation/overwrite.py
@@ -1,11 +1,11 @@
 from typing import Callable, Optional
 
-from ..base.typing import MixinAble
+from ..base.typing import M
 from ..base.toolchain import ToolChain
 from ..base.template import MixinOperation
 
 
-class OverWrite(MixinOperation[Callable]):
+class OverWrite(MixinOperation[Callable, M]):
     """
     OverWrite is rude and it will cover the target method.
 
@@ -33,7 +33,7 @@ def configure(
             target_name=target_name,
         )
 
-    def mixin(self, target: MixinAble, toolchain: ToolChain = ToolChain()) -> None:
+    def mixin(self, target: M, toolchain: ToolChain = ToolChain()) -> None:
         target_name = (
             self.argument.__name__ if self.target_name is None else self.target_name
         )
diff --git a/src/saleyo/operation/processor.py b/src/saleyo/operation/processor.py
index de7b424..5ab707f 100644
--- a/src/saleyo/operation/processor.py
+++ b/src/saleyo/operation/processor.py
@@ -2,12 +2,12 @@
 from types import ModuleType
 from typing import Callable, Optional
 
-from ..base.typing import MixinAble, NameSpace
+from ..base.typing import M, NameSpace
 from ..base.toolchain import Container, ToolChain
 from ..base.template import MixinOperation
 
 
-class Processor(MixinOperation[Callable[[str], str]]):
+class Processor(MixinOperation[Callable[[str], str], M]):
     """
     If you want to get the soure code of a method and use `split` and `replace` to modify and redefine it,Try `Processor`.
 
@@ -55,7 +55,7 @@ def configure(
 
     def mixin(
         self,
-        target: MixinAble,
+        target: M,
         toolchain: ToolChain = ToolChain(),
     ) -> None:
         target_name = (
diff --git a/tests/misc_test.py b/tests/misc_test.py
index 879dc9a..26fdc20 100644
--- a/tests/misc_test.py
+++ b/tests/misc_test.py
@@ -1,4 +1,19 @@
-class a(object):
-    pass
+from saleyo import Mixin, Insert, ReName
 
-print(a.__base__)
\ No newline at end of file
+
+class Foo:
+    def hello(self):
+        print("hello world")
+
+
+@Mixin(target=Foo)
+class MixinFoo:
+    goodbye = ReName("hello", "goodbye")
+
+    @Insert
+    def helloworld(self):  # type: ignore
+        self.goodbye()
+
+
+foo: MixinFoo = Foo()
+foo.helloworld()