To　overcome　the　disadvantage　of　single　yield　performance　of　traditional　metal　damper,　the　metal　tube　damper　with　energy　dissipation　members　composed　of　two　steel　strips　with　different　aspect　ratios　was　proposed,　and　it　has　the　multi-stage　yield　and　failure　characteristics.　The　mechanical　properties　of　the　damper　were　studied　based　on　quasi-static　test,　so　that　the　multi-stage　yield　and　failure　performance　of　the　metal　tube　damper　was　verified　and　its　failure　mechanism　was　revealed.　Furthermore,　the　hysteretic　behavior,　stiffness　degradation　performance　and　energy　dissipation　capacity　of　the　metal　tube　damper　were　investigated,　and　the　influence　of　low　yield　point　steel　of　steel　strips　with　different　aspect　ratios　was　studied.　The　experimental　results　indicate　that　the　damper　has　multi-stage　yield　and　failure　characteristics,　good　deformation　capacity　and　energy　dissipation　performance.　By　applying　low　yield　point　steel　to　different　parts　of　the　damper,　different　functions　can　be　realized.　The　finite　element　model　of　the　damper　was　established,　and　then　the　simulation　results　were　in　good　agreement　with　the　experimental　results,　verifying　the　correctness　of　the　finite　element　model.　Finally,　the　calculation　formulas　of　its　key　performance　parameters　were　proposed,　and　the　feasibility　of　the　trilinear　model　and　the　Bouc-Wen　model　for　characterizing　the　damper　was　validated.　©　2022　Editorial　Office　of　China　Civil　Engineering　Journal.　All　rights　reserved.