Mrs. Zhang, there is not a marriage visa in China. You'd better apply for a new China L visa 1 week before the expiration of your work visa in December. You and your husband can go to the local Exit & Enter Department under Public Security Police Bureau to apply for L visa, the marriage license is very helpful for you to get a L visa valid for 1 year.

The L visa is issued to aliens who come to China for sightseeing, visiting family memembers or other private affairs.