To　protect　museum　cultural　relics　against　seismic　damage,　a　level　isolation　device　for　cultural　relics　is　developed.　To　study　its　isolation　performances,　shaking　table　tests　are　carried　out.　Model　of　showcase　and　replica　of　a　ceramic　cultural　relics　are　made,　the　replica　is　set　in　the　showcase　by　freestanding　status.　Two　cases　of　the　showcase　are　considered:　the　showcase　is　fixed　on　shaking　table　board;　the　showcase　is　fixed　to　top　of　the　isolation　device,　and　the　free　device　is　kept　on　shaking　table　board.　Chichi　earthquake　waves　of　PGA　(Peak　Ground　Acceleration)　=　0.1　g,　0.3　g,　and　0.5　g　are　made　to　act　on　the　showcase　in　x　and　y　directions.　Parameters　such　as　basic　frequency,　stiffness,　displacement　response,　acceleration　response,　dynamic　magnification　coefficient,　and　so　on,　of　the　replica　are　obtained　and　the　isolation　performances　of　the　device　are　verified.　Results　show　that　basic　frequency　of　the　isolation　device　is　0.775　Hz,　with　its　level　stiffness　is　1.52　N/mm.　For　the　replica,　the　isolation　device　makes　oscillation　motions　which　are　similar　to　those　in　case　of　earthquakes,　which　overturns　quickly　due　to　overlarge　amplitude.　In　comparison,　the　replica　placed　in　the　isolation　device　makes　translation　motion　with　much　lower　acceleration　response,　relative　displacement,　and　magnification　coefficient,　which　proves　good　performances　of　the　isolation　device.　©　2016　Taylor　&　Francis　Group,　London.