Unity 5.5.2 empty project iOS Build Size very Large

hello !
I have encountered a problem when I release my project for appstore, I find the ipa file too huge. so I create
empty project and do every thing follow the post(Unity - Manual: Optimizing the size of the built iOS Player. but my ipa file size also 54MB, it’s much large than 22MB refered in the post.

development environment:
unity version: 5.5.2f
xcode Version 8.3.2 (8E2002)

my unity project setting:


my xcode project setting: