Abstract:In this study, Jiangsu Province was used as the research area. The regional linear matrix method was used for the division of consistent areas, the selection of optimal distribution, and the calculation of extreme rainfall frequency estimates. Results show that seven consistent areas are divided in the study area. On this basis, optimal distribution was selected through monte-carlo simulation and Root Mean Square Error(RMSE) comprehensive judgment. The 12-hour time interval under optimal distribution is GLO, GNO, PE3, GEV, GLO, PE3, and GNO. Finally, the calculation of extreme rainfall frequency estimates for each station under a single time interval (1, 3, 6, 12 h) and different reoccurrences was carried out. Under the same precipitation period, the frequency estimates increase with the increase of the return period. The spatial distribution of frequency estimates under the same return period varies significantly, with large value areas consistent with actual observations.