Supercritical　carbon　dioxide　(SCO2)　possesses　the　merits　of　high　density,　low　viscosity.　Hence,　it＇s　promising　in　the　application　of　Brayton　cycle　power　system,　which　owns　compact　system　structure　and　high　efficiency.　In　this　paper,　both　domestic　and　overseas　advances　and　research　achievements　of　SCO2　Brayton　cycle　and　turbomachinery,　i.　e.　turbine　and　compressor,　in　recent　years　were　summarized.　The　characteristics　of　SCO2　and　the　advantages　of　Brayton　cycles　were　introduced.　Then,　the　study　of　SCO2　Brayton　cycle　and　testing　systems　from　various　research　institutions　were　listed.　Besides,　the　design　method,　numerical　analyses　and　experimental　study　of　the　turbomachinery　in　the　SCO2　Brayton　cycle,　which　contains　megawatt　and　kilowatt　turbine　and　compressor,　were　covered.　Hence,　this　paper　provided　the　foundation　for　the　study　of　SCO2　Brayton　cycle　and　turbomachinery　in　the　future.　©　2018　Chin.　Soc.　for　Elec.　Eng.