The　proportional　model　test　of　seismic　response　of　bridge　of　pile　foundation　in　liquefaction　ground　is　done　by　a　large-scale　shaking　table,　which　can　commendably　recurrence　the　main　phenomenon　of　ground　liquefaction　and　structure　breakage　arisen　from　natural　earthquake.　In　input　of　0.15gEl　Centre　wave,　the　upside　of　the　saturation　sand　stratum　is　partly　liquefied;　the　low-frequency　response　of　acceleration　appears　on　pile　and　pillar　frusta;　and　the　peak　value　of　pile　dynamical　strain　fastly　aggrandizes　from　bottom　to　top;　and　moreover,　largely　minishes　up　to　toft　surface.　In　input　of　0.5gEl　Centro　wave,　the　saturation　sand　stratum　is　entirely　liquefied;　the　low-frequency　response　of　acceleration　also　appears　on　pile　and　pile　is　broken;　and　the　peak　value　of　pile　dynamical　strain　fastly　aggrandizes　from　bottom　to　top,　and　moreover,　largely　minishes　up　to　toft　surface.　It　has　importantly　influence　upon　dynamic　response　of　pile　and　pillar　frusta　that　the　saturation　sand　stratum　is　liquefied　or　not.