Landslides induced by many reasons had resulted in heavy casualties and property losses. Therefore, the research on the failure process of the slope and its final accumulation state is necessary. In this paper, three-dimensional particle flow model is established in PFC3D to simulate the slope failure process, triggered by gravity and seismic load respectively, and the final accumulation state. The landslide movement passing valleys of different shapes are studied and compared. The results show that the shape of valley section has great influence for both load cases.