通过室内模型试验，研究了砂土液化对桩基工程的影响，指出了砂土液化时，由于孔隙水压力的上升，土的结构重新调整，桩侧摩阻力将完全丧失．液化后，由于砂土的固结沉降引起桩侧负摩阻力与地面沉降之间成良好的线性关系，推导并给出了由于砂土液化引起桩的负摩阻力的计算方法． Through indoor model tests, the effect of sand liquefaction on pile foundation engineering was studied. It was pointed out that when sand liquefaction occurs, the soil structure will be readjusted and the pile side friction resistance will be completely lost due to the increase of pore water pressure. After liquefaction, because of the good linear relationship between negative friction resistance on pile side and land subsidence due to consolidation and settlement of sand, a calculation method for the negative friction resistance of pile due to liquefaction of sand is deduced and given.