How can i direct deposit 2017 1040EZ return into my mothers checking account. as i have no checking account?

You can't direct deposit into an account that does not have your name on it.

Having your refund deposited into some one else's account is a bad idea.  The bank is most likely to reject the deposit.  When the bank rejects it, it goes back to the IRS.  Then the IRS issues a paper check and mails it to you at the address you put on your tax return.  That will delay your refund by at least a couple of weeks, maybe more.