I am afghan student in china, resident permit is ok to allow me enter china?

I am afghan student in china as scholarship,in harbin university, i got visa for the entrance, and now which i am in kabul for visiting my family i have the resident permit attached in my passport. can i enter china again with having the resident permit which i got from china or shall i get new visa to continue my education?Resident permit valid up to 02.05.2014 and i have the return ticket on February end. Please guide me in this regard.