For　a　super-long-span　cable-stayed　bridge,　it　is　often　required　that　the　main　tower　be　essentially　elastic　under　a　strong　earthquake.　Therefore,　a　seismic　isolation　structural　system　is　often　used　to　reduce　the　seismic　response.　Since　the　seismic　displacement　at　the　end　of　the　deck　may　severely　exceed　the　allowance,　the　elastic　link　device　and　viscous　damper　are　often　employed　to　control　the　displacement.　In　this　article,　a　new　damper　(Metal　Alloy　Brace)　is　used　to　achieve　this　goal.　Under　the　frequently　occurred　earthquake　excitation,　MAB＇s　hysteretic　curve　is　plump,　so　the　structural　deformation　is　reduced.　Under　rare　earthquake　excitation,　MAB　can　supply　so　big　stiffness　that　the　structural　deformation　is　limited,　and　the　damper　will　also　dissipate　much　energy.　And　the　damper　has　no　problem　with　leakage　and　metamorphism.　So,　the　prospect　of　MAB　is　brightening.　©　(2011)　Trans　Tech　Publications.