According to monitoring data of buried stake, sand-deposited pool and sediment trapping dam; based on the lithology and terrestrial surface substance composition; in terms of slope, the land use and vegetation; the soil erosion intensity in every small valley are analogized. Thus the category result of soil erosion intensity in the demonstrating area of Huajiang is concluded and the influence on soil erosion of topography, landforms, lithology, soil, vegetation and precipitation is analyzed precisely.