A　new　type　buckling-restrained　brace　with　tuning　mass　damper　function　(TMD-BRB)　was　designed　and　constructed.　The　composite　function　of　vibration　reduction　was　investigated　by　six　dynamic　and　two　static　specimens.　Tests　show　that　the　wheel-tube　with　long　making　type　TMD-BRB　had　an　ideal　tuning　precision,　a　high　dynamic　coefficient　and　an　obvious　period　performance　of　vibration.　For　its　BRB　performance,　the　specimen　had　a　stable　and　plump　hysteretic　Curve　in　1/85　brace　length.　Various　indexes,　including　1.07　tension-compression　ratio,　normal　stiffness　deterioration　and　skeleton　curve,　10%　energy　consumption　attenuation　by　30　circles　fatigue　test,　was　accorded　with　the　international　regulations.　The　mechanical　structure　could　also　reach　a　constructional　balance　between　the　two　composite　vibration　reduction　functions　with　an　automatic　shift　from　TMD　to　BRB　in　earthquake.