Soil in hilly regions in them iddle of Sichuan Province ismainly a type of purple soilwhich has been developed from the purple shale rock. The vegetation cover is scattered, and the steep slopes are intensively cultivated,leading to severe soil erosion.In addition,the land use pattern is very complex.The present paper introduced a conception of land block as basic unit for erosion monitoring and the potential multi-scale method for erosion assessment on different spatial scales.