if your Bitcoin account has already hacked by hacker the question is, can you get justice for this against hacker? but how, I think Bitcoin in not recognized by law
What do you mean by Bitcoin account? A Bitcoin online wallet? your computer which contains a wallet.dat file or any other sort of private keys? your BitcoinTalk account? It's not clear to me what you are talking about.
Actually even if Bitcoin is not backed by the government, you could still file a police report on a possession being stolen from you. Of course, im not sure if that will turn out ok. If the hacker uses Tor, VPN and so on, you are most likely never going to see your Bitcoin ever again, and that is even if they bother to make a case out of it.
The best defense is good prevention, don't get hacked.