Hello I've got iPad 4 is locked on iCloud account I do not know account I hope a solution to this problem.

Hello there, abdstar.

Sounds like your issue is with Activation Lock. The following Knowledge Base article reviews what the feature is all about:

iCloud: Find My iPhone Activation Lock in iOS 7

http://support.apple.com/kb/ht5818

Additionally this article reviews how to remove the account from a device:

Find My iPhone Activation Lock: Removing a device from a previous owner’s account

http://support.apple.com/kb/TS4515

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.