Abstract: he geological structure of the paleo landslide system in the new site of Wushan is analyzed in the paper and the besic characteristics of tectonic deformation field for the paleo landslide system are discussed. The features of the landslide structure obviously differ from those of regional structure and are also different in the paleo landslide system. For this reason, it can be used to determine the frontier or the back boundary of the landslide and to probe into the evolution of the slide.