In order to analyze the spatial distribution and temporal change of rainfall erosivity in MinjiangRiver Basin,rainfall erosivity was calculated using daily data from 124stations during 1981-2010.Its spatial distribution map was created by Kriging interpolation.Based on Thiessen polygons theory and K-Meanscluster method,we divided the rainfall erosivity into three classes and analyzed the deviation coefficient,tendency coefficient and trend rate of each class.The results showed that annual rainfall erosivity was high insoutheast and lowered rapidly towards west.The rainfall erosivity was divided into three classes with clustercenter of 1 054.73,4 594.50and 7 153.75MJ·mm/(hm²·h·a)respectively.The area of low values wasmainly located in the upstream of the basin and its branch Dadu River basin,the area of intermediate valueswas mainly located in middle and lower reaches,and the high value area was found mainly in the regions ofYa'an,Leshan,Meishan and Dujiang weirs.The inter-annual variability differed spatially;more variationswere found in northern area than in southern area,as divided by the transect of Dujiangyan-Wenchuan-Xiaojin-Danba.Increasing inter-annual variability was found in the western part,whereas decreasing variability in the eastern part.The significance levels of changing trends differed spatially.