The　purpose　of　this　paper　is　to　investigate　the　fatigue　properties　of　C17200　alloy　under　the　condition　of　quenching　aging　heat　treatment　at　high　temperatures,　and　to　provide　a　design　reference　for　its　application　in　a　certain　temperature　range.　For　this　purpose,　the　tensile　and　rotary　bending　fatigue　(RBF)　tests　were　carried　out　at　different　temperatures　(25　degrees　C,　150　degrees　C,　350　degrees　C,　and　450　degrees　C).　The　tensile　strength　was　obtained,　and　relationships　between　the　applied　bending　stress　levels　and　the　number　of　fatigue　fracture　cycles　were　fitted　to　the　stress-life　(S-N)　curves,　and　the　related　equations　were　determined.　The　fractured　surfaces　were　observed　and　analyzed　by　a　scanning　electron　microscopy　(SEM).　The　results　show　that　the　RBF　fatigue　performance　of　C17200　alloy　specimens　is　decreased　with　the　increase　in　test　temperature.　When　the　temperature　is　below　350　degrees　C,　the　performance　degradation　amplitudes　of　mechanical　properties　and　RBF　fatigue　resistance　are　at　a　low　level.　However,　compared　to　the　RBF　fatigue　strength　of　1　x　10(7)　cycles　at　25　degrees　C,　it　is　decreased　by　38.4%　when　the　temperature　reaches　450　degrees　C.　It　is　found　that　the　fatigue　failure　type　of　C17200　alloy　belongs　to　surface　defect　initiation.　Below　350　degrees　C,　the　surface　roughness　of　the　fatigue　fracture　is　higher,　which　is　similar　to　the　brittle　fracture,　so　the　boundary　of　the　fracture　regions　is　not　obvious.　At　450　degrees　C,　due　to　the　further　increase　in　temperature,　oxidation　occurs　on　the　fracture　surface,　and　the　boundary　of　typical　fatigue　zone　is　obvious.