The deposition of sand particles on the friction surface is one of the important factors affecting the tribological properties of friction surface.The use of sand environment simulator is an important means for tribological experiment.A sand environment simulator was designed,which was composed of sand box,blower,dust channel,partition and dust settlement chamber.The two-phase ( air-particle ) flow was analyzed by using the discrete phase model (DPM).The turbulence model SST k-ω was used to simulate the air flow and the Lagrangian particle random trajectory model was used to simulate the flow and deposition of particles.The simulation results show that when other conditions are constant,the higher the inlet gas velocity,the more obvious the particles flow around the dust settlement chamber.When the inlet gas velocity is constant,the mass of deposited particles increases along with the increase of the through-hole diameter in the partition.When the through-hole diameter in the partition is constant,the mass of the deposited particles is greatly affected by inlet gas velocity.A sand environment simulator was made and the tests were carried out to verify the simulation results.It is found that the dust accumulation and mass percentage distribution of particles in the area of the friction pairs are in good agreement with the simulation results,which verifies the feasibility and effectiveness of the self-made sand environment simulator.