In　previous　major　earthquakes,　the　damage　and　collapse　of　structures　located　in　liquefied　field　which　caused　by　site　failure　a　common　occurrence,　and　the　problem　of　assessment　of　liquefaction　possibility　and　discussion　on　the　seismic　response　and　stability　of　liquefied　site　is　still　issue　of　common　concern　in　geotechnical　earthquake　engineering.　To　study　the　influence　of　the　existence　of　structure　on　the　seismic　responses　and　stability　of　liquefiable　sites,　two　groups　of　shaking　table　tests　on　liquefiable　non-free　field　(with　structure)　and　a　free　field　(without　structure)　are　performed.　It　can　be　summarized　from　the　experimental　results　as　following.　The　natural　frequency　of　non-free　field　is　larger　and　the　damping　ratio　is　smaller　than　that　of　a　free　field.　For　the　weak　seismic　loading　condition,　the　dynamic　response　of　sites　shows　similar　rules　and　trend.　For　the　strong　ground　motion　condition,　soils　in　both　experiments　all　liquefied　obviously　and　the　depth　of　liquefaction　soil　in　the　free　field　is　significantly　greater　than　that　in　the　non-free　field,　besides,　porewater　pressure　in　the　non-free　field　accumulated　relately　slow　and　the　dissipated　quickly　from　analysis　of　porewater　pressure　ratios　in　both　experiments.　The　amplitudes　of　lateral　displacements　and　acceleration　of　soil　in　the　non-free　field　are　obviously　smaller　than　that　in　the　free　field　caused　by　the　effect　of　presence　of　the　structure.　In　a　word,　the　presence　of　structures　will　lead　to　the　increase　of　site　stiffness,　site　more　difficult　to　liquefy,　and　the　seismic　stability　of　the　non-free　site　is　higher　than　that　of　the　free　site　due　to　soil-structure　interaction.