I have a question about angluarjs lib folder path, that is why angluarjs lib files in the ionic lib folder? Can anybody help me?
Bower can be a bit of a pain sometimes 
So you should be able to just ignore that if you’re referencing ionic.bundle.js
This is an example of how bower will handle a dependency’s dependencies
first thanks for you reply.you mean ionic is dependency special version of angular,but other (like angular-google-chart) is dependency anthor angularjs version? so my dream folder path is not possible(in picture).
i like folder is clear. 
Honestly, you don’t even need to worry about that directory too much.
If you are referencing ionic.bundle.js (which includes angular 1.3.8, ui-router 0.2.13, and ionic) and then reference angular-google-chart, everything will work fine.
The directory structure doesn’t really matter too much.
ok thanks very much.