How to set the Composite Collider 2D?

In my 2D project,I want to test the Unity 5.6.0f3.
I set the Composite Collider 2D component,but it didn’t work,plz tell me how to use the component?

![3028457–226407–TGDLC4G4LOKT3_]955YG646.png|949x567](upload://omKQDOkvTayvmUYibk0D2EDJFUS.png)

Did you set your child colliders up correctly?

“The Box Collider 2D and Polygon Collider 2D components have a Used By Composite checkbox.”

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