The　traditional　metal　yield　dampers　such　as　buckling-restrained　brace　are　designed　only　for　strong　earthquakes.　Under　small　earthquake,　it　is　difficult　to　dissipate　the　energy　for　common　single-stage　yield　damper.　In　addition,　it　is　difficult　to　observe　its　damage　state　after　earthquake　and　inconvenient　to　replace　the　energy　dissipation　components　separately.　Therefore,　a　new　metal　sleeve　damper　which　can　dissipate　the　energy　under　all　levels　of　earthquakes　is　proposed　in　this　study.　Due　to　the　different　yield　displacements　of　the　energy　dissipation　strips　with　different　aspect　ratios,　the　damper　has　multi-stage　yield　characteristics.　Considering　the　stiffness　degradation　effect　from　the　semi-rigid　joints　on　both　sides　of　the　strips,　the　mechanical　performance　parameters　of　the　damper　are　derived.　The　quasi-static　experiment　of　the　damper　is　carried　out.　Finite　element　method　(FEM)　is　utilized　to　simulate　the　performance　of　the　damper.　At　last,　the　damping　effects　of　the　multi-stage　yield　damper　and　common　single-stage　yield　damper　are　compared.　The　results　indicate　that　the　accuracies　of　the　mechanical　performance　parameters　computation　formulas　are　high.　The　energy　dissipation　performance　of　the　multi-stage　yield　damper　is　excellent.　The　correctness　of　the　finite　element　(FE)　modeling　method　is　verified.　The　seismic　performance　of　the　RC　frame　with　the　multi-stage　yield　damper　is　improved　significantly　under　all　levels　of　earthquakes.　Comparing　with　the　single-stage　yield　damper,　the　multi-stage　yield　damper　is　more　effective　in　the　vibration　control　of　the　reinforced　concrete　(RC)　frame.