The technologies of RS and GIS were applied to obtain the five evaluation factors including annual precipitation,annual temperature,slope,elevation,and land cover within the Buhahe basin.With spatial modeling and analysis,we obtained spatial distribution of soil erosion within the basin and classified soil erosion into different classes.The results showed that in the study area,the total area of soil erosion was 14 337 km²,of which mild and moderate erosion were dominant,accounting for 54.88% and 20.51% of the total eroded area,respectively.A small portion of the basin has experienced severe erosion,accounts for 0.63% of the total eroded area.