Abstract: Rainstorm events occur frequently in China,which is regarded as the main cause of flood disasters. Rainstorm frequency analysis provides a basis for the scientific assessment of rainstorm flood. This paper puts forward the idea of compiling the rainstorm frequency atlas in China. The rainstorm data so far will be comprehensively sorted out and analyzed, so as to extend the rainstorm data series and supplement representative rain stations. Considering the influences of regional climate background and underlying surface conditions on rainfall, the natural catchments regionalization will be divided based on the secondary catchment regionalization. In each natural catchment,the L-Moments method and the Pearson type Ⅲ distribution curve will be adopted for rainstorm frequency analysis of different durations under different frequencies. The confidence interval of design rainstorm will be constructed using Monte Carlo method. The point design rainstorm will be calculated at both grid and small catchment scale based on the spatial interpolation model. Furthermore, the typical rainfall events will be selected to construct the regional intensity-area-duration relationship and determine the design rainstorm distribution. The national precipitation frequency atlas and database will be constructed taking small catchment and kilometer grid as two basic spatial scale. This study is expected to provide technical reference and decision-making basis for the objective understanding of the rainstorm and flood disaster risks in China.