The amount of soil erosion in the Qingcheng project area was predicted using remote sensing(RS) images,Geographical information system(GIS) technology and the revised universal soil loss equation (RUSLE). The annual average amount of soil erosion in the Qingeheng project area was estimated to be about 7 058 t/km², belonging to intense erosion.Soil erosion degree map was obtained through soil erosion degree classification.The seriously eroded area(greater than 10 000 t/km²) accounted for 24.8 % of the total area,but contributed 62.2 % of sediment of the whole watershed.The amount of soil loss on the land greater than 25 degree of slope was greater than 10 168 t/km².Therefore,control of soil loss on the land is the key to the solution of soil erosion in the area. The method of soil erosion investigation will provide quick,quantitative and scientific data for strategies of both soil erosion prevention and soil protection.