Abstract: Based on discrete element method (DEM), the DEM software was used to simulate the bulk material handling process. Considering the current DEM method cannot be applied to calculating the motion of tiny particles, the particles were comparatively simulated with sizes of 75, 100 and 150 mm and it was found that the results were close to the actual operating conditions for particles with sizes of 50~300 mm. The impact coefficient was proposed to characterize the impact influence, which can be used to compare the impact effect in different cases of blanking height and particle size. The maximum impact force and coefficient of single particle and particle flow can be obtained by computer simulation, which reflect the impact effect of particle flow very well. The fact that the normal force of particles acting on the conveyor belt approximates to the gravity of bulk material confirms the accuracy of the calculation results.