According to the classical algorithm by Wischimeier of rainfall erosivity R=EI30,this study,taken the natural rainfall in Yangling of southern Loess Plateau as the research object,analyzed in detail the size distribution of rainfall during a precipitation process,and regressed the relationship between the median diameter of raindrops,rainfall energy and rainfall intensity,meanwhile,rainfall erosivity from June to September with the indicators of EI10,EI30,EI60 was calculated,as well as the relationship betw...