i want to invite my wife to live with me during my study time

Hello there, i'm from Somalia and my fiancee is from Poland i'm a medical student in Changchun

we are just getting married soon, i would like to take my wife with me to live with me in China till i finish my studies, i have one year left. she already has the L to come with me. can i change her L to S in China?
what documents is required to apply for it? does it need proof from both our embassies, or do we need to register our marriage in China too?