is there any function like GetComponentsInChildren can get all Component?

GetComponentsInChildren function can get all the Component which is active;
but now i need all the component.
include active and unactive.
do u known any function can do this?

Take a look at the GetComponentsInChildren() reference page:

You will see the function includes an optional second parameter that is false by default. Set it to true, and the function will find inactive components as well.