[Objective] To designate key control zones for soil and water loss at or above the county level

and to guide the scientific development of soil and water conservation measures and to improve the effectiveness of soil erosion control.[Methods] On the basis of dividing national and the key prevention regions of soil and water loss in Shaanxi Province

forest coverage

soil erosion intensity and soil erosion control degree were used as quantitative indexes. Headstream

water source and protective zone of basic farmland were used as qualitative indexes.[Results] Using GIS and RS technology

by explaining the remote sensing translation using town as a basic unit

through the combination of qualitative and quantitative methods

the research generated a division graph of key prevention regions of soil and water loss in Shaanxi Province. It was further modified using the qualitative indexes upon the rules of "fragment connected to area

key region outstood

and generalized appropriately. The classification and nomenclature of key prevention regions of soil and water loss focused on geomorphic type

and reference function of soil and water conservation.[Conclusion] This article divided Shaanxi Province into 6 soil and water loss prophylaxis areas and 6 soil and water loss control areas

which could provide a basis for the soil and water conservation planning of Shaanxi Province

being prepared and for standardizing soil and water conservation supervision work in production and construction projects

and also a reference for cities and counties division of soil and water loss prevention and control areas.