Up　to　now,　rare　experimental　researches　focus　on　the　seismic　response　of　long-span　bridges　under　multi-support　earthquake　excitation.　A　1:10　three-span　continuous　rigid　framed　bridge　model　is　designed　according　to　a　practical　long-span　reinforced　concrete　bridge　with　high　piers　in　order　to　carry　out　the　corresponding　shaking　table　tests.　The　uniform　excitation,　traveling　wave　effect,　local　site　effect　and　the　combination　of　the　above　two　effects　are　considered　in　the　experiment.　The　experimental　results　indicate　that　the　continuous　rigid　framed　bridge　is　sensitive　to　the　spectrum　characteristics　of　the　ground　motions,　and　the　seismic　responses　show　great　difference　in　various　earthquake　excitations.　When　the　surface　wave　velocity　is　lower,　the　deformation　of　the　pier　and　the　strain　at　the　bottom　of　the　pier　increase　under　the　traveling　wave　excitation.　The　effect　varies　with　the　surface　wave　velocity　and　the　constraint　condition　types,　and　the　bottom　of　the　pier　is　more　sensitive　to　the　traveling　wave　effect.　If　the　local　site　effect　is　considered,　the　deformation　of　the　pier　and　the　strain　at　the　bottom　of　the　pier　also　increase,　and　the　effect　is　different　for　the　positions　such　as　the　middle-pier,　the　abutment,　the　bottom　of　the　pier　and　the　connections.　When　the　traveling　wave　effect　and　local　site　effect　is　considered　simultaneously,　the　dynamic　responses　of　the　pier　are　bigger　than　those　under　uniform　excitation,　solo　action　of　the　traveling　wave　effect　or　local　site　effect.　Therefore,　it　is　important　to　consider　the　effects　of　spatial　variation　of　ground　motion　for　the　long-span　bridges　seismic　analysis.