Slip behavior between soft landing mechanisms and simulant lunar soil is one of the most important factors

which influence the stability of lunar explorer landing. Duralumin was the material of cushioning mechanism foot pad. A series of simulant lunar soil - aluminum plate shear tests are performed by direct shear apparatus. The shear deformation and strength of interface between simulant lunar soil-smooth aluminum plate under different relative densities

different shear velocities and different normal stresses are studied. Interface under slightly dense soil presents ideal elastoplastic deformation

accompanied with strain-softening. The interface strength increases with the normal stress increase accompanied with shear velocity; interface friction angle is 26.8°- 31.4°.