Present　study　numerically　investigated　the　heat　transfer　between　supercritical　CO2　and　cooling　water　in　enhanced　tubes.　Firstly,　the　heat　transfer　performance　difference　between　smooth　tubes　and　threaded　tubes　for　supercritical　CO2　was　compared.　Then,　the　effects　of　structural　parameters　(rib　number,　width,　and　helix　angle)　of　the　threaded　tubes　on　heat　transfer　performance　were　analyzed.　The　results　showed　that　under　the　same　operating　conditions,　the　heat　transfer　coefficient　of　the　threaded　tubes　was　105%　higher　than　that　of　the　smooth　tubes.　Furthermore,　the　heat　transfer　performance　of　supercritical　CO2　in　the　threaded　tubes　increased　with　the　increase　in　rib　number,　width,　and　helix　angle.　Specifically,　compared　to　the　four-rib　threaded　tube,　the　comprehensive　heat　transfer　coefficient　of　the　five-rib　and　six-rib　threaded　tubes　increased　by　6.58%　and　16.37%,　respectively.　Moreover,　compared　to　the　narrow　rib　width,　the　comprehensive　heat　transfer　coefficient　increased　by　18.59%　for　the　medium　rib　width　and　62.91%　for　the　wide　rib　width.　Additionally,　compared　to　the　6°　helix　angle,　the　heat　transfer　coefficient　increased　by　8.17%　and　9.72%　for　the　7°　and　8°　tubes,　respectively.　©　2023　Copyright　held　by　the　owner/author(s).