In this paper, multispectral and panchromatic images of SPOT 5 in October 2004 and Beijing-1 satellite in September 2007 were selected to extract the information of soil erosion, with four factors, namely the vegetation coverage, slope, soil erodibility and land use, as the supplemental data. The changes of soil erosion in such aspects as distribution, area and intensity type and the driving force of these changes were analyzed in the northern mountainous area of Beijing during the period of 2004~2007. The results show that soil erosion was mainly light erosion and subordinately moderate erosion. Although the soil erosion intensity increased in some places, the total erosion area tended to decrease. The general erosion trend was moderate → light → slight in the northern mountainous area of Beijing in the period of 2004~2007. The overall situation had been markedly improved. Soil and water conservation efforts made by Beijing Municipal Government in recent years have proved to be highly effective.