I came to US in 2007 as F-1 student, now I'm still a full time student. However, I got my green card in Jan 2010.
Now I'm filing my 2010 tax return. I heard that as long as I'm a full-time student, I still can get the 5000 treaty. Is this true? Then should I file 1040 or 1040NR?

Thanks,

NOT as a green card holder. When you accepted the green card, you became fully liable for all U.S. taxes and forfeited any benefits of the U.S.-China Tax Treaty.