Supercritical　water　gasification　(SCWG)　technology　has　broad　application　prospects　due　to　its　cleanliness　and　high　efficiency,　and　the　Stefan　flow　on　the　particle　surface　during　the　reaction　process　cannot　be　ignored.　In　this　paper,　the　Influence　of　different　Stefan　flow　directions　and　intensities　on　the　drag　and　the　heat　transfer　of　supercritical　water　(SCW)　cross　owing　around　a　fixed　spherical　particle　with　Re　numbers　in　the　range　of　10~200　is　studied.　At　the　same　time,　the　flow　field　and　velocity　and　temperature　boundary　layer　around　the　particle　are　analyzed.　The　results　show　that　with　the　increasing　intensity　of　the　inward　Stefan　flow,　the　drag　coefficient　and　Nusselt　number　both　show　an　increasing　trend,　and　the　thickness　of　the　velocity　and　temperature　boundary　layer　shows　a　decreasing　trend;　the　intensity　of　outward　Stefan　flow　increases,　and　the　above　conclusion　shows　the　opposite　trend.　©　2021,　Science　Press.　All　right　reserved.