In　order　to　investigate　the　hysteretic　behavior　of　recycled　aggregate　concrete　with　ferronickel　slag-filled　steel　tubular　(RAC-FNSFST)　columns,　the　quasi-static　loading　was　implemented　on　nine　specimens　with　different　replacement　ratios　(RACs),　axial　load　levels,　length–diameter　ratios,　and　diameter–thickness　ratios.　The　hysteretic　curves,　skeleton　curves,　deformability,　energy　dissipation　capacity,　and　stiffness　degeneration　were　studied　after　loading　and　failure　mechanisms　were　observed,　followed　by　the　construction　of　FE　models　for　parameter　analysis.　It　is　demonstrated　that　the　hysteretic　loop　curve　is　full,　and　the　hysteretic　performance　was　not　dramatically　affected　by　the　replacement　ratio　of　RAC.　With　axial　load　level　increase,　ultimate　strength　at　descending　stage　degrades　quickly,　stiffness　degeneration　accelerates,　and　hysteretic　energy　dissipation　increases.　Stiffness　degeneration　and　hysteresis　energy　dissipation　are　enhanced　as　the　length–diameter　ratio　increases.　However,　when　the　diameter–thickness　ratio　decreases,　hysteretic　energy　dissipation　increases,　and　stiffness　degeneration　accelerates.　In　addition,　a　suitable　FE　model　was　established　and　compared　with　experimental　results.　Then　a　wide　range　of　parameter　studies　was　carried　out　as　a　supplement　to　the　experimental　study.　It　is　shown　that　the　ultimate　strength　and　ductility　of　specimens　are　intimately　correlated　with　the　RAC　strength,　yield　strength　of　steel　tube,　slenderness　ratio,　axial　load　level,　and　steel　ratio.　©　2022,　Korean　Society　of　Steel　Construction.