DPM model,built on the principles that the dust emission flux is proportional to the dust saltation flux and the kinetic energy flux of saltating particles,is composed of two components:the saltation flux of soil microaggregates and dust particle emission.To validate the applicability of DPM to sem-iarid areas,we selected fourtypical types of farmlands( soils) in the sem-iarid north-central Shaanxi Province,measured and calculated thesurface aerodynamic roughness,microaggregate distribution of surface soils,friction velocity,and threshold friction velocity on each study area,and comparatively analyzed the DPM model simulation accuracy betweenthe different soil types and between different seasons.The results showed that DPM model can be used to simulate dust emission flux of the different soil types in the sem-iarid farmlands,and can better simulate dust emission flux for the summer and winter seasons in the sem-iarid farmlands.