But I know if you are first time to see this website, you won't know where could start to study.
I choose one important page, RepRap Options, translated into Chinese.
You can quick review the main parts of 3D printer.
This page attempts to make some sense, in general, of how all the pieces fit together to create a RepRap.
However, if you want to skip all this stuff and get straight to getting your hands dirty then your best bet is to take a look at The incomplete reprap beginner's guide and the build instructions category. In addition to those guides, you may also want to take a look at the links under the Models section below.