Abstract: A discrete element model of a banana screen was established based on the 3D discrete element method. Virtual experiments were performed on difficult-screening particles with 0.8 times the diameter of the screen aperture,and the particle distribution under the state of particle stratification and penetration was obtained. The dependences of the screening effect of the model upon the screen inclination angle,vibrating angle and vibrating intensity were also discussed. As the vibrating intensity increases,the screening efficiency and the screening completion time decrease. When the screen inclination angle is 0.5°,the vibrating angle is 45° and the vibrating intensity is 3.5,the screen has the best screening effect,in which the screening efficiency is 92.2% and the screening complete time is 9.95 s.