Abstract：The Three Gorges dam construction on the Yangtze River in China is the largest hydroelectric project in the world. After the first impoundment in June 2003，many landslides occurred or were reactivated. Shuping landslide is one of the most active landslides among them，which is a reactivated landslide occurred in shale and sandstone of Tertiary period. As soon as the first impoundment of the Three Gorges reservoir was conducted，serious deformation occurred in the Shuping landslide. It formed a large dangerous factor for the local residents and the shipment in the main stream of the Yangtze River. The deformation of the Shuping landslide is monitored by GPS extensometers；and crack measurements are summarized. Based on the monitored data，the deformation features of the Shuping landslide caused by water level changes are analyzed. Also，for the investigation of the groundwater situation，1 m-depth ground temperature measurement was conducted；and the groundwater veins were estimated. It is found that there was no obvious deformation occurred in the head of the landslide. Extension deformation occurred in the upper part，and comparison deformation occurred in the lower part，while the deformation at the middle part was not obvious. As indicated in GPS monitoring results sooner after the impoundment of the reservoir，the lower part has faster displacement rate downward faster than that of the upper part. Currently，the displacement of the lower part was almost terminated while the upper part displaced downward gradually and compressed the lower part at the current water level. Through the investigation on the groundwater and comparison of deformation with rainfall data，it is estimated that the water level change of the Yangtze River is not the only affecting factor for the reactivation of the Shuping landslide. Groundwater condition of the Shuping landslide should also be further investigated.
