In order to study the hovering flow field and sand dust movement law of a rotorcraft in ground effect (IGE) hovering due to sand dust inhalation, Fluent software was used to calculate the flow field continuously based on Reynolds averaged N-S equation and K-ω(SST) turbulence model, combined with the parallel algorithm of CFD (Computational Fluid Dynamics) and DEM(Discrete Element Method). Through API(Application Programming Interface), the hovering flow field of helicopter rotor is calculated and compared with the PIV（Particle Image Velocimetry） measurement results. After that, the momentum data of flow field is transmitted to discrete phase to calculate the complete trajectory and particle distribution of dust. The results show that: when the convection field is accurately simulated, the force movement and spatial distribution of sand dust particles are well simulated by using the discrete element method, which can understand the ground effect flow field and the force movement law of fine dust particles with multi parameters, and directly present the development process of sand blindness.