The　steady-state　condensation　performance　of　R1234ze(E),　propane　and　R134a　in　a　horizontal　circular　mini-channel　was　numerically　investigated.　The　effects　of　mass　flux,　vapor　quality　and　physical　properties　on　condensation　performance　were　discussed.　At　the　same　condition,　condensation　heat　performance　of　propane　was　the　best　and　then　the　R134a　and　R1234ze(E).　However,　the　pressure　gradients　of　R1234ze(E)　were　larger　than　that　of　propane　and　R134a.　The　average　film　thickness　of　propane　and　R1234ze(E)　were　an　average　of　9.4%　thicker　and　15.7%　thinner　than　that　of　R134a,　respectively.　The　effective　conductivity　played　an　important　role　in　the　heat　flow　rate　of　three　refrigerants.　Unlike　the　R1234ze(E)　and　R134a　for　which　the　condensate　tended　to　be　stratified　at　x　=　0.5,　there　was　no　obvious　stratification　for　propane.　The　published　correlations　tended　to　underestimate　the　pressure　gradients　of　R1234ze(E)　significantly.　(C)　2018　Elsevier　Ltd　and　IIR.　All　rights　reserved.