The dense degree of soil plays an important role in bearing behavior of large size rock socketed filling pile with steel tube in the inland wharf.Contact interface shearing tests are carried out under certain conditions of moisture content and grain composition with different degree of dry density of samples.The relationship between the shear stress and displacement,limiting shear strength and residual strength of reciprocating shearing under different normal stress of different degree of dry density are studied.The results show that there are three stages during the shearing process of steel soil interface including elastic stage,plastic stage and failure stage.The Mohr coulomb criterion is met by limiting the shear strength.Cohesion and internal friction angle are increased linearly with the increasing dry density.In the process of reciprocating shearing,the maximum shear stress remains unchanged of the same shearing direction in different circulations.However,the negative direction of shear stress is slightly larger than the positive direction of shear stress.