Plastic　buckling　of　diagonal　chords　in　outriggers　has　often　been　observed.　The　macro　beam　element　has　a　limited　capacity　to　simulate　the　strength　and　stiffness　deterioration　caused　by　plastic　buckling.　Based　on　the　typical　component　seismic　tests　of　outrigger,　the　multi-scale　finite　element(FE)model　of　outrigger　combined　with　the　beam　and　shell　elements　is　proposed　considering　both　accuracy　and　efficiency.　And　then　the　whole　FE　model　of　one　typical　super-tall　building　is　built　up　with　the　proposed　multi-scale　model.　Finally,　the　whole　process　of　earthquake-induced　collapse　of　super-tall　building　is　discussed　considering　the　plastic　buckling　of　outriggers.　The　results　indicate　that　the　proposed　multi-scale　model　of　outrigger　can　accurately　and　efficiently　predict　the　initial　stiffness,　yielding　strength　and　the　strength　and　stiffness　deterioration　caused　by　plastic　buckling.　During　the　earthquake-induced　collapse　simulation　of　super-tall　building,　the　seismic　energy　dissipation　capacity　of　outriggers　will　be　overestimated　and　the　damage　of　shear　walls　and　mega-columns　will　be　underestimated　if　the　plastic　buckling　of　outrigger　is　not　considered.　Consequently,　these　will　affect　the　potential　collapse　mode　and　overestimate　the　collapse　resistance　of　super-tall　buildings.　©　2018,　Editorial　Board　of　Journal　of　Tianjin　University(Science　and　Technology).　All　right　reserved.