The best way to research Chinese law in UST library catalog is by subject.
Law -- China is a good subject to start your research in the library catalog.
Chinese Law Series is also a good series. This series covers various laws of China. Not all of the books are held by the UST libraries, but they can be borrowed through Interlibrary loans. To see all the books, click here. Some of the titles include:
There are many good online research guides prepared by librarians at other law schools. The following lists some of those guides. [I will add annotations as we go along.]
LexisNexis China would be a great resource.
Westlaw China would be another great resource.
This website has a wealth of information for Chinese Law, the most useful one is the Chinese Law Reporter, coming out monthly.