Abstract: In order to master the regularity of dust mass concentration distribution in a belt conveyer roadway and obtain rational parameters for the design of dust removal by ventilation, taking the 40^# belt conveyer drift of the hoisting system in Xishimen Iron Mine as the research background, dust mass concentration in the belt conveyer roadway was simulated using the discrete phase model for computational fluid mechanics, which is based on the theory of gas-solid two-phase flow. By contrast with field measurement of dust mass concentration distribution, the simulating results were essentially coincident with the measured data, indicating that using the Euler-Lagrange method to simulate dust mass concentration distribution in the belt conveyer roadway is feasible. In the design of dust removal by ventilation, the dust mass concentration can be kept within 3 mg·m^-3 as the wind velocity is 3 m·s^-1. The dust mass concentration is lower at the belt conveyer velocity of 2.5 m·s^-1. In addition, regular wall sprinkling can decrease the dust mass concentration.