Abstract: Based on discrete element method, the grain flow model of pulverized coal passing through screen pipe is established by PFC^3D software. The paper studies the anti-blocking performance of hole-protecting screen pipe by simulating the volume of pulverized coal particles passing through screen pipe, analyzes the influence laws of screen mesh diameter, particle size ratio and surrounding pressure parameters on the performance of pulverized coal particles passing through screen pipe. The results show that the passed particle volume increases with the increasing of screen mesh dimeter and particle size ratio, and gradually increases with the increase of the screen mesh dimeter. Generally, the passed particle volume increases with the increasing of ambient pressure, but there is a “violent change” interval, the ambient pressure increases to a certain range, the passed particle volume increases suddenly.