Printed　circuit　heat　exchanger　(PCHE)　is　an　essential　part　of　supercritical　CO2　(sCO(2))　Brayton　cycle　in　the　3(rd)　generation　of　concentrating　solar　power　plant.　Molten　salt　and　sCO(2)　as　the　heat　transfer　fluid　in　PCHE,　it　is　of　great　significance　to　improve　its　thermal　and　hydraulic　performance.　To　reach　this　goal,　two　new　discontinuous　fin　channels　of　PCHE　were　designed　and　their　thermal-hydraulic　performance　was　studied　by　numerical　simulation.　The　results　show　that　the　second　discontinuous　fins　channel　with　the　best　comprehensive　thermal-hydraulic　performance　for　sCO(2),　which　has　the　Colburn　j　factor　improvement　by　2.1-4.6%　and　the　Fanning　friction　factor　f　reduction　by　3.8-6.4%　compared　with　that　of　the　airfoil　fins;　While　the　third　discontinuous　fins　channel　has　the　best　hydraulic　performance　for　both　the　heat　transfer　medium　of　molten　salt　and　sCO(2),　among　which　the　pressure　drop　per　unit　length　and　f　have　the　largest　reduction　by　0.05-24.7%　and　5.91-19.1%　for　sCO(2),　and　by　25.62-29.39%　and　1.35-2.4%　for　molten　salt.　As　a　result,　the　second　and　third　discontinuous　fins　channel　of　PCHE　are　proposed　to　sCO(2)　and　molten　salt,　respectively,　which　can　contribute　to　design　the　PCHE　for　the　3(rd)　generation　of　solar　thermal　power　generation.