Shaking　table　testing　on　seismic　performance　and　interaction　of　PHC　pipe-piles　in　saturated　soils　had　been　conducted　using　a　series　of　sine　wave,　typical　earthquake　waves　as　well　as　artificial　ground　motions　based　on　in-site.　The　testing　results　involving　time　histories　of　ratios　of　water　pore　pressure　and　responding　displacement　related　to　the　soils　liquefaction　were　presented.　The　testing　results　indicate　that　the　natural　frequency　of　soil-pile　system　gradually　reduced,　which　means　that　the　piles　are　damaged　gradually.　Moreover,　the　displacement　responses　of　piles　in　saturated　soil　and　unsaturated　soil　have　a　little　difference　that　the　peak　displacements　are　larger　than　that　in　unsaturated　soil.　In　addition,　the　prestressed　degree　is　benefit　to　the　resist　the　damage.　The　researches　can　be　used　to　calibrate　FE　models　and　provide　a　data　base　on　seismic　design　of　PHC　pipe　piles.　©　ASCE.