| Combined with the digitalization of remote-sensing image and GIS methods, investigations were carried out on typical sampling areas with its size of 1km2 in small watershed, and get the multi-factors information of patches with its precision of 10?0 m2. According to the features of target regions and its function factors, relative important factors, including slope gradient, vegetative cover, rainfall, gully density and soil anti-scourability were determined for soil and water loss evaluation. After the classification and sort with types of factors affecting soil erosion, relationship curve was determined on basis of the analysis of information source from computer and remote sensing, and its effect on soil erosion intensity. Based on the statistical analysis to these materials, factor's contribution to soil erosion and its value were determined, after which 5 factors model for comprehensive soil erosion evaluation was setup. Based on the above researches, typical small watershed, which has been artificially interpreted, was selected for comparatively analysis and precision checking. And the results indicated that this kind of model is applicable for local soil erosion evaluation with higher precision. Results from this study provided new thoughts for soil erosion and soil & water conservation research, and scientific and technological support for local ecological construction.
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