This　paper　assesses　the　exergetic　performance　inside　transcritical　CO2　ejector　refrigeration　system　integrated　with　thermoelectric　subcooler　(EJE　+　TES)　through　conventional　and　advanced　exergy　analyses.　The　results　point　out　that　89.44%　of　the　total　exergy　destruction　is　endogenous,　which　clearly　demonstrates　that　it　is　not　close　in　the　interrelations　among　the　system　components.　In　addition,　increasing　the　efficiency　of　the　different　components　can　decrease　the　exergy　destruction　by　about　53.36%.　The　avoidable　exergy　destructions　induced　by　the　compressor　is　the　highest,　which　indicates　that　priority　should　be　given　to　the　improvement　of　the　compressor,　followed　by　the　thermoelectric　subcooler,　evaporator,　ejector　and　gas　cooler,　while　the　expansion　valve　has　almost　no　potential　for　improvement.　This　conclusion　differs　from　that　obtained　by　the　conventional　exergy　method.　The　effects　of　the　pinch　temperature　difference　in　each　heat　exchanger,　as　well　as　the　compressor　and　ejector　efficiencies　on　cycle　theoretically　exergetic　performance　are　considered.　When　the　compressor　and　ejector　efficiencies　increase　from　0.5　to　0.9,　the　avoidable　endogenous　exergy　destruction　taking　place　in　the　corresponding　system　component　are　reduced　by　93.61%　and　82.33%,　respectively.　The　performance　of　the　EJE　+　TES　system　can　be　enhanced　through　reducing　the　pinch　temperature　difference.　(C)　2021　The　Authors.　Published　by　Elsevier　Ltd.