A gigantic landslide happened at Qianjiangping Village of the Three Gorges area in Zigui County, Hubei

Province on July 13,. 2003. Combining advanced remote sensing digital technique with the relief map data, the

authors set up the DEMS before landslide and after landslide of this area. On the basis of these high-resolution

satellite images, a 3D terrain model was constructed. Interactive interpretation was employed to get

characteristic features, the slide direction and the distance between various parts of landslide were calculated,

and then the volume was estimated, which is 1.5×107m3. Making good use of geological data, disaster theory and

GIS, the authors found out the caused for Qianjiangping landslide. It is believed that the main triggering factors

seem to have been the sluice of the Three Gorges and continuous heavy rainfall.