Abstract: The Three Gorges reach is an area of potential soil and water loss owing to its huge topographic relief and heavy precipitation, so the sediment eroded away from it takes a significant proportion of the sediment inflow of the Three Gorges reservoir. This portion, however, has always been neglected since the preliminary design because of the difficulty in its quantitative estimation. This article presents a calculation of soil erosion in each of three typical years (2000, 2007 and 2010) using the GIS spatial analysis technology and a RUSLE model of statistical method to lay a basis for quantitative estimation. By this calculation, we found out that the average soil erosion modulus is 2474, 2126 and 1844 t/（km2?a）respectively, and that the estimated amount of soil erosion in the three years are 145, 124 and 108 million tons respectively.