Abstract: A theoretical model is suggested to mathematically describe the evolutionand the wind feedback mechanism of the wind-blown grain flow. In thistheoretical model, the coupling interaction between the wind flow andsaltantgrains and the effect of electrostatical force are considered and the windfield is regarded as changing with time. The time for the entire systemto reach a steady state, the variation curves of the saltant grain numberand the grain transport rate with time, the mass-flux profiles and windprofiles at a steady state are calculated based on this theoretical model.These calculation results are well in agreement with the experimentaldata with the average charge-mass ratio of 60μC/kg.