Abstract: Based on the discrete element method of the Particle flow code(PFC2D),simulate the deformation,failure and slide whole process of the deposit landslide. According to field investigation, the causes and formation mechanism of the Baidian township I landslide are summarized. The landslide is caused by the internal and external geological action, the main reasons is the loosen structure of the deposit, rain infiltration after strong rainfall and form weak slip zone, cause the slope creep and deformation. A series of biaxial tests are simulated to establish the relationship between micro parameters and macro mechanical properties. Then, the landslide geological model is established and the whole process of deformation and failure of the landslide is simulated by softening the strength of slip zone considering rainfall conditions. The progressive failure process of landslide is simulated. The simulation results show that the shear crack concentrated in the slope foot and the tension crack concentrated in the top of the slope, with creep deformation of the slope slowly, cracks scope in the slope toe expanding gradually and the tension crack occurs in the middle part of the slope; the sliding velocity can be divided into four stages:sliding creep deformation,slip acceleration,slip deceleration and slow accumulation. Based on the landslide displacement and finally accumulation state show that Baidian township Ⅰ landslide threatening the safety of Longtan Village primary school and the rural road, the simulation results have an important guiding value for the project management of the landslide.