This　study　investigates　the　seismic　response　and　failure　mode　of　a　pile-structure　system　in　a　liquefiable　site　by　employing　a　numerical　simulation　model　combined　with　the　shaking-table　results　of　a　soil-pile-structure　dynamic　system.　The　pile　and　soil　responses　obtained　from　the　numerical　simulations　agreed　well　with　the　experimental　results.　The　slopes　of　the　dynamic　shear-stress-shear-strain　hysteretic　curves　at　different　positions　also　exhibited　a　decreasing　trend,　indicating　that　the　shear　strength　of　the　soil　in　all　parts　of　the　foundation　decreased.　The　peak　acceleration　of　the　soil　and　pile　was　not　clearly　amplified　in　the　saturated　sand　layer　but　appeared　to　be　amplified　in　the　top　part.　The　maximum　bending　moments　appeared　in　the　middle　and　lower　parts　of　the　pile　shaft;　however,　the　shear　forces　at　the　corresponding　positions　were　not　large.　It　can　be　observed　from　the　deformation　mode　of　the　pile-group　foundation　that　a　typical　bending　failure　is　caused　by　an　excessive　bending　moment　in　the　middle　of　the　pile　shaft　if　the　link　between　the　pile　top　and　cap　is　articulated,　and　sufficient　attention　should　be　paid　to　the　bending　failure　in　the　middle　of　the　pile　shaft.