Abstract: The changes of groundwater level, deep displacement and surface displacement were analyzed, based on the monitoring data obtained from Xiakou slope before and after the Lushan earthquake. The results show that：(1)the groundwater level rised abnormal before the earthquake, with the range of more than 1m. It reached the peak on the earthquake day. After the earthquake, it began to rapidly decline, at about 1.5m; (2)Landslide occurred a deep displacement of more than 1mm caused by the earthquake, then restore basic steady state. Landslide stability was analyzed by using the R/S analysis method. The Hurst index was significantly decreased in the April affected by the earthquake, indicating the stability of landslide decreased. But the Hurst index was greater than 0.5,indicating that the landslide was stable.