By use of different precipitation data collected by 27 weather stations from 1979-2015 in Dongting Lake basin,we used precipitation Z–index, wavelet analysis and linear trend analysis to do comparative analysis with a set of worldwide available data. The data included observation precipitation(CMD), and the gridded precipitation data including National Center for Environmental Prediction Climate Forecast System Reanalysis(CFSR), European Center for Medium Range Weather Forecasts ERA–Interim reanalysis data(ERA–Interim), the Climate Predictio...