Abstract: Under the effect of the seismic load,pile foundation is prone to deformation and stress concentration at the interface between two soil layers.This phenomenon is particularly obvious at the interface between frozen soil and the other soil layers which can eventually lead to pile failure.The EPS material is effective on stress concentration and pressure-relief,and widely used as roadbed filler.The EPSmaterial was proposed to be the protective layer between pile and frozen soil in the depth of frozen soil.Shaking table modeling test and numerical simulation was conducted to evaluate the EPS material's vibration reduction performance.This effect of plastic material was also discussed in further numerical simulation.It shows that the EPS material can reduce the peak value of strain,shear force and pressure of pile in the frozen soil.The plastic material has stronger capacity to reduce them,and the effect becomes better as the cross-sectional area of material increases.