Buckling　of　the　longitudinal　rebar　is　one　of　the　main　forms　of　plastic　hinge　failure　in　reinforced　concrete　(RC)　columns　after　an　earthquake.　This　rebar　buckling　significantly　impacts　the　seismic　bearing　capacity　and　energy　dissipation　capacity.　To　restrain　the　development　of　longitudinal　rebar　buckling　behavior　and　delay　the　degradation　of　lateral　strength　in　RC　columns,　this　paper　developed　a　new　type　of　buckling　restraint　rebar　(BRR)　consisting　of　three　components:　longitudinal　rebar,　a　restraint　sleeve,　and　foam　material.　First,　the　BRR　mechanical　properties　under　compression　and　tension-compression　cyclic　loading　were　obtained　through　quasi-static　loading　tests.　Then,　the　BRR　compression　and　tension-compression　cyclic　loading　processes　were　numerically　simulated　based　on　ABAQUS　finite　element　software.　The　simulated　results　were　compared　with　the　test　results.　Finally,　a　stress-strain　constitutive　model　for　this　new　BRR　was　proposed　based　on　this　study.　Results　showed　that　the　restraint　sleeve　could　significantly　enhance　the　lateral　stiffness　and　the　bearing　capacity　of　longitudinal　reinforcement　after　yielding.　The　compressive　performance　of　BRR　was　mainly　affected　by　the　length　and　wall　thickness　of　the　sleeve.　The　cyclic　performance　was　mainly　affected　by　the　length　of　the　sleeve　and　the　clearance　between　the　sleeve　and　the　reinforcement.　The　BRR　constitutive　model　proposed　in　this　paper　can　accurately　reflect　the　influence　of　restraint　sleeves　on　the　stiffness　of　longitudinal　reinforcement　after　yielding.