Roseivivax　marinus　strain　TCYB24　is　a　rod-shaped　bacterium　of　Rhodobacteraceae　isolated　from　the　gill　of　deep-sea　mussel　Bathymodiolus　marisindicus　which　collected　from　the　Tiancheng　hydrothermal　vent　under　depth　of　2700　m　on　the　southwest　Indian　ridge.　In　our　previous　study,　the　strain　TCYB24　was　proved　to　produce　quorum　sensing　signal　of　N-Acyl-homoserine　lactones　(AHLs)　and　form　biofilm.　In　order　to　determine　its　adaptive　mechanism　against　the　extreme　environment　of　deep-sea　hydrothermal　vents,　the　whole　genome　was　sequenced　by　high-throughput　Illumina　tag　sequencing.　The　results　show　the　whole　genome　consists　of　one　circular　chromosome　and　eight　circular　plasmids,　with　a　total　length　of　4.60　Mb　(G　+　C　content　of　67.4%),　4338　open　reading　frames,　46　tRNAs　and　6　rRNA　operons.　According　to　the　genome-wide　functional　annotation,　numbers　of　heavy　metal　resistance,　high　pressure　and　cold　adapting　related　genes　were　found.　In　addition,　genes　about　exopolysaccharide　(EPS)　biosynthesis　and　secretion　and　biofilm　formation,　which　facilitate　bacteria　to　resist　extreme　environments,　were　identified.　Intriguingly,　a　pair　of　RaiI/R-type　quorum　sensing　system　was　discovered　firstly　in　the　bacterium　isolated　from　hydrothermal　environment.　The　results　may　help　to　understand　genetic　underpinning　of　extreme　environmental　adaptation　mechanism　of　bacteria　in　deep-sea　hydrothermal　area.　©　2022