This　paper　investigates　the　influence　of　site　liquefaction　on　seismic　responses　of　an　offshore　bridge.　A　three-dimensional　saturated　soil-bridge　model　and　the　same　model　without　consideration　of　saturated　soil　were　modeled　on　the　platform　of　OpenSeeS.　The　response　results　of　the　two　models　have　been　compared　and　discussed.　The　results　showed　that　liquefied　sites　had　an　obvious　amplification　effect　on　the　surface　ground　motion　as　well　as　the　non-liquefied　sites.　The　frequency　content　and　the　characteristics　of　the　input　motion　may　significantly　affect　the　dynamic　responses　in　liquefied　sites.　Site　liquefaction　amplified　the　pier　top　absolute　displacements　and　internal　forces　at　the　pier　bottom.　Furthermore,　liquefied　sites　modified　the　distribution　of　internal　forces　when　compared　with　non-liquefied　sites.　The　increases　of　the　displacements　may　increase　the　possibility　of　pounding　between　the　deck　and　the　abutment　or　inducing　collapsing,　which　close　attention　and　consideration　should　be　given　to.　©　2019　Associazione　Geotecnica　Italiana,　Rome,　Italy.