Abstract:In order to explore the changes in soil shear strength during soil wind erosion, typical ploughed farmland on the disturbed and undisturbed surfaces of the Bashang Plateau in Hebei Province was used as theresearch object. The changes of soil shear strength before and after wind erosion events and wind erosion seasons were measured by in-situ direct test, and the relationship between soil shear strength and particle size of soil dry aggregate was also analyzed in conjunction with laboratory experiments. The results showed that the shear strength of undisturbed and disturbed surface soil was positively related to the normal stress acting on the soil surface, and the soil shear strength increased with the increasing of the normal stress. The change of shear strength was closely related to the occurrence of the wind erosion events, and a significant increase in shear strength occurred after the wind erosion event in both cases, except for the surface soil after the wind erosion event on April 27 and 28, 2021, which was influenced by the water content. The change of shear strength throughout the wind erosion season also showed a trend of firstincreasing, then decreasing and finally slightly increasing. In the process of wind erosion, the surface of disturbed farmland was more sensitive and its shear strength changed more sharply than that of undisturbed farmland surface. The soil shear strength increased with the increasing of mean weight diameter (MWD) of soil dry aggregate. In order to reduce the damage of wind erosion in Bashang plateau, conservation tillage measures should be reasonably applied, the interference to farmland surface should be reduced during the wind erosion season.