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In accordance with the national standard HB 5258-83 "Antioxidant determination test method for steel and high temperature alloy", this paper implements high temperature oxidation performance tests of single crystal high temperature alloy. Three different heat-treated single crystal samples were oxidized at 900℃ and 1000℃ for 125h. The oxidative properties were determined by discontinuous weighing method and cyclic oxidation method. The oxidation of the sample after oxidation was analyzed by XRD, and SEM, EDS was used to study the composition and morphology of the surface of and longitudinal section of the sample. At 900℃ and 1000℃, the heat treatment of the sample with the best oxidation resistance is SHT + 1100℃/30min AC, and the heat treatment of the sample with the worst oxidation resistance is SHT + 1100℃/10min AC.

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