The　RANS　method　and　realizable　k-epsilon　turbulence　model　are　adopted　to　numerically　investigate　the　turbulent　flow　and　heat　transfer　performance　of　dimple/protrusion　arranged　in　rectangular　channel　with　the　working　fluid　of　supercritical　carbon　dioxide　and　air.　Investigated　Re　is　90000.　The　Nu　distribution,　the　flow　resistance　coefficient　f　and　the　comprehensive　thermal　performance　TP　were　obtained.　According　to　the　results,　it　is　obtained　that　the　Nu/Nu(0)　of　supercritical　carbon　dioxide　cases　is　about　2.3　times　higher　than　the　values　of　air　cases　at　the　Re　of　90000.　The　f/f(0)　of　supercritical　carbon　dioxide　cases　is　close　to　the　values　of　air　cases.　The　TP　of　supercritical　carbon　dioxide　cases　is　about　2.4　times　higher　than　the　values　of　air　cases.　The　conclusion　can　be　obtained　that　supercritical　carbon　dioxide　has　significant　heat　transfer　performance　while　not　increasing　the　flow　resistance　at　high　Re.　Furthermore,　the　supercritical　carbon　dioxide　dimple　case　possesses　the　best　comprehensive　thermal　performance　following　the　supercritical　carbon　dioxide　protrusion　case.