I am preparing the documents for renewing my B1/B2 visa of US. I found the following guide while doing Google search for the related information.
United States Visa System (美国签证体系 - 赴美签证实用指南)
It is a very good, practical guide for people who want to apply for a US visa in China, though the document is initially intended to provide "information for experts from the People’s Republic of China attending meetings of the ISO and IEC held in the United States".
FYI: How to obtain a 10-year US B1/B2 visa?