The　main　girder　and　the　piers　of　bridges　are　generally　linked　with　sliding　bearings.　Under　seismic　excitation,　pounding　effects　between　the　main　girder　and　the　abutment,　the　adjacent　girder　and　the　blocking　device　caused　by　excessive　relative　displacements　between　piers,　abutments　and　the　girder　are　highly　probable.　The　effects　can　not　only　damage　the　structure　but　also　lead　to　collapsing.　Based　on　a　continuous　viaduct,　the　paper　studied　the　disciplines　of　the　pounding　response　under　uniform　seismic　excitation　and　the　spatial　seismic　excitation,　then　put　forward　that　the　composite　metal　damper　may　reduce　the　effect　of　pounding.　The　research　shows　that　under　same　seismic　intensity,　the　results,　including　pounding　force,　the　shear　force　of　the　fixed　bearings　and　the　plastic　hinge　on　the　piers,　are　amplified　under　multi-point　excitation　than　under　uniform　excitation.　And　composite　metal　dampers　can　reduce　the　seismic　responds　under　frequent　earthquakes　and　prevent　or　largely　reduce　the　pounding　effect　under　severe　earthquakes.　Therefore　the　effect　of　pounding　on　the　dynamic　performance　can　be　lessened.　The　seismic　reduction　is　widely　and　well-adapted　under　both　uniform　excitation　and　multi-point　excitation.　©　(2014)　Trans　Tech　Publications.