With　hot-rolled　steel　Q235　in　China,　six　specimens　of　buckling-restrained　braces　are　designed,　manufactured　and　tested.　The　loops＇　characterization　of　the　restoring　force　versus　the　deformation　is　studied.　The　feasibility　of　modeling　the　BRB　specimen　with　the　Bouc-Wen　model　is　discussed,　and　some　shortages　leading　to　considerable　errors　to　the　restoring　force,　such　as　the　absence　of　asymmetrically　mechanical　properties　and　plastic　hardening　etc,　are　indicated.　On　the　basis,　an　improved　model　with　three　suggested　parameters　is　established.　The　practical　calculation　formulas　for　the　three　parameters　are　suggested.　Comparisons　are　made　between　the　calculated　results　with　the　model　and　the　tested　results　of　both　UCB　(under　the　low　cycle　increasingly　imposed　displacement　tests　and　earthquake　induced　displacement-imposed　test　respectively)　and　that　of　the　paper.　It　is　approved　that　the　model　performs　better　than　the　unimproved　model　on　the　hysterical　loops,　equivalent　stiffness　and　damping　ratio.　Some　suggestions　are　made　on　the　structural　design　and　analysis　of　BRB　product　tests.