I finally know why my iTunes crash when open!

SInce last month, my iTunes crash everytime when open.

I asked the question at: https://discussions.apple.com/thread/6021712

Later, I found that turn off wifi make iTunes work fine.

Finally, today i know the true reason, because I use a global proxy by .pac file (for across the great wall)

If connect apple.com default with proxy cause iTunes crash.

If you have a similar problem, please refer to this.