Q: itunes  tell me the device timed out . I'm not understand what's mean

Hello mohamed abdo,

The article linked below provides some useful troubleshooting steps that can help resolve this issue.

If the USB communication to your iOS device isn't working properly, you may see one or more of these symptoms when attempting to sync your iPhone, iPad, or iPod touch:

• An alert messages indicates "iPhone has timed out" during syncing.

iOS: Troubleshooting USB-related alerts when syncing

http://support.apple.com/kb/TS5254

Cheers,

Allen