Abstract: The process and method on dynamic monitoring of water and soil loss for the Thre ee Gorges reservoir area using RS and GIS are introduced.Firstly,the classifica tion of land and the calculation of available coverage of plant cover are perfor med by remote sensing image handling software ERDAS,and then,the space analyses of varieties of water and soil loss are done by the ARCGRID of geographical i nformation system software ARC/INFD,and finally,the intensities and the areas of water and soil loss for every counties or small valleys for different intensitie s are estimated respectively.