To　improve　the　utilization　of　renewable　energy　in　combined　cooling,　heating　and　power　system　(CCHP),　a　new　scheme　of　CCHP　based　on　a　hybrid　of　reversible　proton　exchange　membrane　fuel　cell　(RPEMFC)　and　expander　is　proposed,　where　the　pressure　energy　of　electrolyzed　oxygen　is　recovered　by　ejector　and　expander.　The　exhaust　heat　and　cool　air　of　RPEMFC　and　expander　are　used　to　improve　the　system　efficiency.　A　thermodynamic　model　is　developed　to　conduct　the　sensitivity　analysis　of　energy　efficiency,　exergy　efficiency,　energy　consumption　of　compressor,　energy　recovery　of　expander,　heat　and　cool　air　supply.　The　results　show　that　the　50　kW　RPEMFC　based　CCHP　system　can　obtain　electrical　efficiency　56.2%,　thermal　efficiency　35.2%,　overall　efficiency　91.4%,　and　exergy　efficiency　54%.　The　energy　efficiency　of　the　system　exceeds　89%　within　the　range　of　power　generation　from　15　kW　to　85　kW.　The　exergy　efficiency　and　energy　efficiency　of　the　system　are　sensitive　to　the　changes　of　ejector　flow　ratio　and　the　pressure　of　ejector　driving　flow.　The　change　of　compressor　outlet　pressure　has　little　influence　on　the　energy　efficiency　of　the　system,　but　its　increase　is　beneficial　to　the　cool　air　supply　of　the　system.　©　2020,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.