Soil erosion is an important topic in the planning of soil and water conservation in the urban area. On the basis of the references, the authors introduced the approach of blurry evaluat ion into the classif icat ion of soil erosion in the urban area. An operable evaluation model was const ructed through the analyses of various evaluating indexes, which can be regard as a means of determining soil erosion degree in the planning of soil and water conservation in the urban area.