An　accurate　condensation　model　plays　an　important　role　in　the　development　of　high-efficiency　turbine.　Mai　efforts　have　been　devoted　into　the　research　on　steam　non-equilibrium　condensation.　However,　aiming　at　t　cryogenic　gas　at　high-speed　flow　the　studies　on　the　condensation　model　are　still　inadequate　and　i　comprehensive.　In　present　paper,　different　condensation　models,　established　via　the　alternations　of　nucleatii　model　and　droplet　growth　model　are　compiled　into　commercial　CFD　software　to　simulate　the　non-equilibriu　condensation　flow　within　a　cryogenic　radial-inflow　turbo-expander.　Firstly,　the　rotation　effect　on　droplt　diameter　and　distribution　within　the　impeller　passage　are　analyzed.　The　results　point　out　the　region　where　lar　droplets　are　prone　to　form　and　gather.　Furthermore,　the　influence　mechanism　of　heat　and　mass　transfer　varying　condensation　models　on　the　flow　fields,　including　rapid　nucleation,　supercooled　degree,　liquid　ms　fraction,　droplet　diameter,　are　revealed　based　on　the　analysis　of　Nusselt　number　and　Knudsen　number.　T　results　imply　that　the　predicted　location　of　condensation　onset　is　little　sensitive　to　the　droplet　growth　model.　last,　the　effect　of　modifications　for　nucleation　rate　and　droplet　growth　rate　on　the　thermodynamic　losses　turbo-expander　are　quantificationally　discussed.