The essence of cutting coal is a process of impacting and breaking the coal with picks. It is difficult to analyze the dynamic process based on the th eory and experiment methods. This paper presents a 3dimensional digital model u sing the simulation module of impact and cutting in ANSYS／LSDYNA, and the dyn a mic process of cutting coal with conical picks is simulated visually. Time curve s of speed, acceleration and energy related to researched parts were obtained. E ffects of different pick installation angles on cutting efficiency were analyzed . The conclusion is that when the pick installation angle is 40°its cuttinge fficiency is higher than others.