after i update the newest version, my computer cannot detect my iphone5.

Hello kong.144,

I understand that your iPhone 5 is not recognized by iTunes. The following article may help to resolve your issue:

iOS: Device not recognized in iTunes for Windows

http://support.apple.com/kb/TS1538

Thanks,

Matt M.

Version 11.1.5.5 of iTunes was just released today. If you update to that, does that help with the recognition troubles?

http://www.apple.com/itunes/download/