Abstract: The Tangyang landslide section close to the dam located in Kajiwa reservoir. Its huge scale, has a certain effect on power plant engineering. According to the research on the geological conditions, deformation characteristics and the formation mechanism of the slope, according to the data, earthquake, rainstorm, leading edge, landslide, the status of the landslide is evaluated by 5 factors. The rigid body limit equilibrium method and the FLAC3D quantitative calculation are carried out. The qualitative and quantitative evaluation are basically the same.