Abstract: Through the investigation on the basic geological characteristics of Yanjiagou landslide in Shanyang County of Shaanxi Province, the paper obtains landslide elevation data by means of drone, and establishes a MatDEM-based 3D discrete element model of the landslide movement and accumulation features, which restores the whole process of landslide occurrence and gains the characteristics of movement velocity, sliding distance, and accumulation thickness. It is considered that the Yanjiagou landslide is of high-speed type. The landslide accumulation process is divided into three stages: accelerated collision→overall sliding→deceleration accumulation. The distribution of accumulation thickness shows a general trend of increasing first and then decreasing along the movement direction, reaching the maximum at the back of accumulation body. It is proved that MatDEM is feasible to simulate the landslide evolution process.