i bought thi iphone 4 on ebay, hi ask me apple id, no i'm not a former owner dont't know. pliz halp

Contact the seller and ask them. In iOS 7 and Activation Lock, without that AppleID password you just bought a brick.

See the section titled "What if I purchase a device that is still linked to the previous owner's account?" on this support page:

http://support.apple.com/kb/HT5818

If the seller won't help you, then as Michael said you've basically purchased a brick, and quite possibly a stolen iPhone.

Regards.