Abstract: Based on the weighted residual principle,a method to determine cyclic p–y curves of shaking table model test results of soil-pile interaction was developed.The degradation of cyclic p–y curves and the damping of soil-pile interaction were analyzed for strata with different initial relative densities.The cyclic p–y curves were compared with the pseudo static degradation p–y curves.It was shown that the p–multiplier depended not only on the initial relative density,but also on the depth of strata if the pseudo static degradation p–y curve was determined using the p–multiplier method.