Soil erosion quantity and soil anti-erodibility can be reflected by the amount of surface residual particles with wind erosion.It is of great importance to precisely extract particles content on earth surface.Based on digital image processing technology,the extraction of soil particles on wind erosion surface in northern foot of Yinshan Mountain has been done.The result showed that the particles area processed by ERDAS IMAGINE 9.0 was smaller than that processed by ArcGIS 9.2,but there was a remarkable linear relation between them.We can use this relation to compensate particles deficiency area.The fractal dimension obtained by means of particles equivalent area and equivalent perimeter was 1.418 4.The soil particles condition reflected by this fractal dimension on research region was in accordance with that real condition.With image processing software,we can extract accurate surface particle information.It can provide a foundation for future desertification monitoring,also,it was greatly meaningful for us to swiftly and exactly valuate the degree of soil wind-erosion and land desertification.