My apple ID has been disabled,how can get it back?

When your account becomes disabled, Apple provides the following recommendation:

"This message means that someone tried and failed to sign in to your account multiple times. The Apple ID system disables the account to prevent unauthorized people from gaining access to your information. You need to reset your password, following the instructions at the Apple ID website".

Visit iForgot.com and follow the instructions there.

In order to change your Apple ID or password for your iCloud account on your iOS device, you need to delete the account from your iOS device first, then add it back using your updated details. (Settings > iCloud, scroll down and hit "Delete Account")

Providing you are simply updating your existing details and not changing to another account, when you delete your account, all the data that is synced with iCloud will also be deleted from the device (but not from iCloud), but will be synced back to your device when you login again.

In order to change your Apple ID or password for your iCloud account on your computer, you need to sign out of the account from your computer first, then sign back in using your updated details. (System Preferences > iCloud, click the sign out button)

In order to change your Apple ID or password for your iTunes account on your iOS device, you need to sign out from your iOS device first, then sign back in using your updated details. (Settings > store, scroll down and tap your ID)

If that doesn't help you might try contacting Apple through iTunes Store Support