Three　buckling-restrained　braces　(BRBs)　assembled　with　section　steel　were　designed　using　novel　soft　steel　LY315　as　the　core　material.　Cyclic　loading　tests　on　three　specimens　were　conducted　to　analyze　the　mechanical　properties　and　the　energy　dissipation　of　the　new　type　of　BRBs.　The　results　indicate　that　the　structure　of　BRBs　is　reasonable　and　all　specimens　exhibit　a　full　hysteretic　curve　and　stable　energy　dissipation　performance.　The　ultimate　ductility　coefficients　of　specimens　were　greater　than　15.　The　strain　hardening　coefficients　were　between　1.21　and　1.29.　The　equivalent　damping　ratios　were　between　0.442　and　0.465.　The　cumulative　plastic　deformations　were　more　than　500　times　the　yield　displacement.　The　fatigue　loading　was　analyzed.　All　performance　parameters　were　able　to　meet　the　requirements　in　JGJ　297-2013　＇Technical　specification　for　seismic　energy　dissipation　of　buildings＇,　indicating　excellent　low-cycle　fatigue　behavior　of　the　BRBs.　©　2019,　Engineering　Mechanics　Press.　All　right　reserved.