Numerical　simulation　models　for　pile　group-superstructure　in　liquefiable　and　non-liquefiable　sites　were　established.　The　validity　and　reliability　of　the　numerical　model　are　verified　by　the　shaking　table　test　results.　Based　on　the　cross-correlation　analysis　of　superstructure　acceleration-pile　bending　moment　and　soil　displacement-pile　bending　moment　obtained　from　the　tests,　the　coupling　law　of　kinematic　and　inertial　interaction　and　its　influence　on　pile　failure　modes　were　discussed　combined　with　the　numerical　simulation　results.　The　results　shown　that　the　effect　of　kinematic　interaction　on　piles　were　greater　than　that　of　inertial　interaction　in　both　types　of　sites,　but　coupling　mechanisms　of　kinematic　and　inertial　interaction　were　different.　For　the　liquefiable　site　scenario,　the　middle　part　of　piles　was　prone　to　bending　failure　and　the　kinematic　interaction　was　the　main　reason　for　it.　For　the　non-liquefiable　site　scenario,　the　inertial　interaction　had　an　obvious　influence　on　the　pile　failure　occurred　at　the　pile　top.　The　results　of　parameter　analysis　shown　that　the　mass　of　the　superstructure　was　the　most　important　parameter　of　inertial　interaction　in　the　liquefiable　site.　Parameters　of　inertial　interaction　would　affect　the　vibration　of　the　superstructure　in　the　non-liquefiable　site,　but　the　influence　on　pile　bending　moments　was　not　obvious.