I just made a replay,took me 3 hours to do it.But when there was 16 frames left.I press the "Space Bar" two times by accident.Is there anyway to recover my replay?Please help,it is very important to me (TT_TT)...

Did you by chance have autosave On?

If no, your replay gone. No chance to get it back.

http://forum.toribash.com/showthread.php?t=275105

It won't recover your replay, but it will prevent you from losing your replays again =)