Can i refile my tax return?

Yes but why do you want to start over?  Do you need to change it?  You can go back in and change your return.  You can switch to Efile.  

I already summit the return form and this return is ready to mail, is it possible to go back?

Please explain what you mean when you say you "already summit" the return.  Assuming you mean "submitted" ---but what did you do?  Did you click a big orange button that said "Transmit my returns now?"   We cannot tell if you mean you just prepared a return that has not been filed at all or if you e-filed it or mailed it.