Abstract: Based on NCEP reanalysis data( 1°×1°),FY-2G satellite data,Doppler radar data and precipitation data of automatic weather stations, severe convective rainfall occurring in Huaping and Changning have been analyzed on 15th and on 16th in September 2015.The results show that the western Pacific subtropical high is the main cause of the weather change,with the water vapour Fluxesof four and six g·cm-1·hPa-1·s-1,and the water vapor flux divergence of -3×10-7、-2×10-7 g·cm-1·hPa-1·s-1 before raining,the airflow convergence occurring in Huaping and Changning,and water vapor condition and dynamic conditions is far less than the strong precipitation process.Both of the areas of rainstorm experienced a process of generation and development about β-Mesoscale Convective System on satellite.In Huaping ,with high reflectivity and high echo top features,with a number of times when the velocity map presenting a upwind characteristic,and in the 3.4 degree elevation velocity continuous divergence characteristics.In Changning,the main reason for heavy rain lasting 8 hours was persistent “train effect”,with 35—45 dBz strong echo center located in the region of heavy rain.