The oxidation behavior of a second generation nickel-based single crystal superalloy with high Cr content at 1 000 ℃ and 1 100 ℃ was studied by the discontinuous weight gain method. The phase constituents and microstructure of the oxide layer of the alloy were characterized by XRD and SEM. The oxidation mechanism of the alloy and the difference in oxidation behavior at different temperatures were analysed, and the temperature sensitivity of the oxidation behavior of the alloy was clarified. The results show that the oxidation kinetics of the experimental alloy at 1 000 ℃ followed the parabolic law. The weight gain maintains a low level even after 500 h of oxidation. The outer oxide layer is Cr 2 O 3 with TiO 2 distributed in clusters outside the Cr2 O 3 layer and a small amount of TiN particles dispersed on the substrate. The whole oxide layer is complete and compact, and the alloy has excellent oxidation resistance. When the temperature rises to 1 100 ℃, spallation occurs after oxidation for 100 h. The outer oxide layer becomes loose and porous, the amounts and size of the inner nitrides increase significantly, and the oxidation resistance of the alloy deteriorates. The mechanism of the influence of temperature on the oxidation performance of the alloy is that the volatilization rate of Cr 2 O 3 increases with temperature. As the temperature increases to 1 100 ℃, the increased volatilization rate of Cr 2 O 3 increases the porosities of the oxide film, generates an impact on the oxide layer, and reduces the inhibition effect of oxygen and nitrogen, thus deteriorating the oxidation resistance.