Abstract: Taking the Luoyugou watershed in Tianshui as an evaluation area,the information of land use was extracted by using interpretating high resolution remote sensing image as well as field investigation,then vegetation coverage was also calculated based on the information of soil type.GIS was used to build digital elevation model(DEM) for 1∶ 10000 topographic map,and the terrain slope was extracted.The evaluation model of soil erosion intensity was built through comprehensive analysis of the data obt..