Precipitation is an input factor of the global water cycle, and it is a crucial index to describe the climatic change. The stable isotopes deuterium and oxygen-18, and the radioactive isotope tritium are components of the water molecule, and, as a consequence, are ideal natural tracers for describing the “history” of the water cycle. Therefore, a systematic observation of isotopes in precipitation could be used as a tool for climatological interpretation of palaeorecords, validation of global atmospheric circulation models and global/regional scale water balances. First, a brief review of the Global Network of Isotopes in Precipitation (GNIP) is presented, then, how that was in China is summarized. Based on CERN, Chinese Network of Isotopes in Precipitation (CHNIP) is established. Furthermore, the content, features and results already obtained characters and what have already got which were based on CHNIP data are introduced.