A　kind　of　composite　wall　of　light　steel　and　tailings　microcrystal　foamed　plate　(SMF　composite　wall)　was　proposed.　In　order　to　study　the　seismic　performance　of　SMF　composite　wall,　four　low　reversed　cyclic　loading　tests　of　full-scale　specimens　were　carried　out.　The　failure　characteristics,　bearing　capacity,　hysteretic　behavior,　stiffness　degradation　and　energy　dissipation　capacity　of　specimens　with　different　parameters　were　analyzed.　The　finite　element　numerical　simulation　was　carried　out,　and　the　calculated　results　were　in　good　agreement　with　the　test　results.　The　research　results　show　that　the　light　steel,　reinforcement　and　tailings　microcrystal　foamed　plate　of　the　SMF　composite　wall　work　together　under　load.　The　increase　of　strength　of　tailings　microcrystal　foamed　plate　enhances　the　restraint　effect　on　light　steel　and　improves　the　seismic　performance　of　the　specimen.　After　filling　fly　ash　blocks　between　the　light　steel　keels,　the　restraining　effect　was　enhanced　and　the　failure　mode　of　composite　wall　was　changed.　The　seismic　performance　of　the　composite　wall　was　significantly　improved.　When　the　tailings　microcrystal　foamed　plate　was　made　of　splice　plate,　due　to　the　poor　integrity　of　the　panel　wall,　the　restraint　capacity　to　the　light　steel　keel　was　weakened,　and　its　bearing　capacity,　stiffness　and　energy　consumption　capacity　were　weakened　to　a　large　extent.　Therefore,　the　splice　plate　should　not　be　used　when　considering　the　seismic　design.　©　2023　Science　and　Technology　Periodical　Press.　All　rights　reserved.