In　order　to　meet　the　demand　of　watching　games,　the　LED　display,　i.e.,　the　center-hung　scoreboard,　has　been　widely　used　in　large　stadiums.　To　investigate　the　mechanical　properties　of　the　suspend-dome　structure　with　the　center-hung　scoreboard　under　the　action　of　earthquake,　a　dynamic　scaled　model　with　a　geometric　similarity　ratio　of　1:20　was　designed.　And　the　shaking　table　test　was　performed　to　study　the　seismic　performance　under　the　actions　of　8　degree　frequent,　seismic　precautionary　and　rare　earthquakes.　The　acceleration,　displacement　and　internal　force　responses　under　three-dimensional　seismic　were　analyzed.　The　results　show　that　the　Z-directional　acceleration　amplification　factors　of　the　reticulated　shell　vertex　region　are　significant　and　decrease　fastest　under　actions　of　rare　earthquakes,　which　is　the　weak　point　of　the　model.　The　influence　of　the　center-hung　scoreboard　on　the　structure　cannot　be　ignored　in　the　study　of　seismic　performance.　The　vertical　displacement　is　the　largest　in　the　center　and　gradually　decreases　from　inside　to　outside.　The　maximum　displacement　under　actions　of　frequent　earthquakes　is　2.061　mm.　The　maximum　displacement　under　actions　of　seismic　precautionary　earthquakes　is　1/　556,　the　maximum　displacement　under　actions　of　rare　earthquakes　is　1/242,　both　of　which　satisfy　the　requirement　of　seismic　specifications.　The　maximum　internal　force　of　the　ring　rod　first　decreases　and　then　in-creases　from　the　center　to　the　surroundings.　The　internal　force　of　the　radial　rod　gradually　increases　from　the　edge　to　the　center.　Under　actions　of　rare　earthquakes,　the　center-hung　scoreboard　has　more　influence　on　the　internal　force　of　the　rod.　The　accuracy　of　the　finite　element　modeling　method　is　verified　by　comparing　the　simulation　results　and　test　results　of　the　scaled　model,　and　the　reliability　of　the　scaled　model　is　verified　by　comparing　the　simulation　results　of　the　scaled　model　and　the　prototype　structure.　The　structure　does　not　collapse　under　actions　of　8　degree　rare　earthquakes　and　does　not　show　apparent　failure.　The　seismic　principle　that　＂the　structure　hasn＇t　damaged　under　frequent　earthquake,　repairable　under　precautionary　earthquake,　and　doesn＇t　collapse　under　rare　earthquake＂　is　reached,　thus　the　structural　design　of　the　Lanzhou　Olympic　Sports　Complex　is　reasonable.