In order to study the influence of the shear properties at the steelsoil interface with dryingwetting cycles on the softening deformation of soil around the steelcasing rocksocketed pile, initial samples with a certain moisture content, dry density, and gradation were designed. And shear tests on the steelsoil interface and soil body were carried out in five cases, including a initial state and four different numbers of dryingwetting cycles. In each case, samples were subjected to four vertical pressures: 50kPa, 100kPa, 150kPa, and 200kPa. The results show that the influence of dryingwetting circles on the shear strength of soil is greater than that on the shear strength of the steelsoil interface. During the shear process, there is an elasticplastic stressstrain relationship, and no strainsoftening phenomenon occurs at the steelsoil interface under dryingwetting circles. With the increase of the number of dryingwetting circles, the friction angles of the steelsoil interface and soil change little, while their cohesive forces increase first and then decrease.