The phaeozem region of Northeast China is an important commodity grain base.The phaeozem degradation and soil erosion caused by long-term natural erosion and overexploitation limit the increasing of production.Vegetation not only plays an important role in controlling soil erosion

intercepting precipitation and improving soil erosion resistance

but also has a direct effect on erosion degree.The amount of soil erolion in Uucheng watershed of Keshan County

Heilongjiang Province is estimated using bilogical control fate for method by which vegetation coverage is extracted from high-resolution remote sensing images with RS and UIS technology and makes qualitative and quantitative analysis.Results show that soil erosion has a close relation with vegetation coverage

which means that vegetation plays an important role in controlling soil erolion and demonstrates that the method used in the study is applicable in similar studies

depending on its accuracy and credibility.