The universal soil Ioss equation has been payed great attention and Widely used in many countries since it put forward.It is difficult to be directly used in China because it is vast in territory and greatly regional variation in climate

soil.topography etc Based on deep analysis and quantitative evaluation to factors which have influence on soil erosion the chinese researchershope to estabilish erosion prediction model which is suted for their country or a certain region。Some main progresses and achievements in evaluation study to those factors are introduced in China since 1980s。