1. Jiangsu Province Geological Survey Institute, Nanjing 210018, China;
2. The 1st Geological Brigade of Jiangsu Geology and Mineral Exploration Brigade, Nanjing 210041, China;
3. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Taking the mountain landslide on the west side of a reservoir dam as the research object, the authors use FLAC^3D numerical simulation software to analyze the stability of landslide under natural and heavy rain conditions before and after landslide treatment. The results show that the maximum displacement before treatment is about 4.71 cm under natural conditions and the slope body is basically stable. However, under the condition of heavy rain, the slope is severely slipped, the maximum displacement reaches 4.01 m, and the slope is in an unstable state. After treatment and reinforcement, the maximum displacement of the slope decreases to 2.08 cm under natural conditions, and 10.42 cm under heavy rain conditions. Anti-slide piles are ideal for controlling landslides and achieving the desired treatment effect.