Based on the TM images<1989 and 1999)and the SPOT 5 images(2007),the dynamics of soil erolion in the Jiasikong forest farm of Daofu County,Tibetan Autonomous Prefecture of Uarze,Sichuan Province,was monitored using remote sensing(RS) and geographical information system(UIS).Results show that the area of moderate erosion and severe erosion increased from 1989 to 1999,before the implementation of the natural forest protection project(NFPP).After the implementation of the NFPP,the area of severe erosion deceased as accompanied with the increase of moderate erosion area,indicating a better situation of soil and water loss control.The deteriorating tendency of soil erosion has been inversed,but the inversed degree is not significant.This suggests that the NFPP has an important effect on promoting the vegetation restoration and improving the functions of soil and water conservation.