| According to the Wind speed of field observation during the three sandstorms in Gansu Province Minchin area, through deal with and analysis the wind speed of field observations, Calculated the surface roughness and wind friction during three sandstorms. Took the surface soil micro aggregate samples in Gansu Province Minchin area, and has carried on the analysis to the grain-size distributions of surface soil micro aggregate through the dry sieve analysis. The grain-size distributions of surface soil in Gansu Province Minchin area are fitting, the expression will be 2 to 3 Lognormal distribution groups' combination.Based on above measured data and in processing result, using Dust Production Model Simulated the saltation flux, dust emission flux and dust emission rate during the three sandstorms in Gansu Province Minchin area. Studied the influence of the grain-size distributions of surface soil in Gansu Province Minchin area to saltation flux, dust emission flux and dust emission rate. Take the Minchin area as the example, simulated Arid, semiarid area soil dust emission flux. Studied the influence of the grain-size distributions of surface soil, soil moisture, the great particle size soil block and comprehensive surface condition to soil dust emission.
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