The reservoir area is subject to frequent human activities that are damaging the fragile balance of (ecosystem) dynamics. Remote sensing(RS), a geographical information system(GIS) and global positioning system(GPS) technology, as well as network techniques, have been utilized for the present research. A digital elevation model(DEM) was prepared; adjustment of orthographic reflection for images took place; interfusion of multi-source image data was undertaken; and multi-layer information was extracted. This work enabled comprehensive monitoring of soil and water conservation for the whole reservoir area from the middle 1980s to the late 1990s, and in 2000. Subsequently, the Three Gorges Project(TGP) commenced and has been ongoing for 7 years, and monitoring has included land use status, degree of vegetation cover, water loss and soil erosion(including wash erosion, mass erosion and mechanichal erosion), and their dynamic variations over the 15 year study period. On this basis, the concept of this paper has been developed with the aid of the ArcGIS software platform.