Analysis of the variation characteristics of different water bodies is the basis of applying isotopic tracer technique in regional water cycle research. Based on the samples of atmospheric precipitation,surface water( river water) and groundwater( spring water and well water) in Changsha from January 2012 to December 2013,the study analyzed the variation characteristics of δD and δ18O in different water bodies. The results showed that the values of D and18 O in precipitation of Changsha showed obvious seaso...