I am a graduate student. I am interested in all the chinese information and maps at your website and trying to design a small project for my class. But I find there are no information about the map projection. The administrative Region map projection is different from that of the Fundamental Maps.
You can find the projection information for the administrative regions data at:
http://sedac.ciesin.columbia.edu/china/admin/bnd90/bnd90desc.html
and the Digital Chart of China at:
http://sedac.ciesin.columbia.edu/china/geogmap/dcchina/dcchinadesc.html
The digital chart data are ‘unprojected’ (ie, geographic).
We often get these questions from ArcView or MapInfo users (and some other packages), when you import these files using ArcInfo the projections are documented directly from the file we provide; the other GIS packages do not read this information in.