Abstract: The thermal oxidization stabilities of high flash point jet fuel at 150~315℃ and 370~400℃ were examined by JFTOT test. The results show that the thermal oxidization stabilities of jet fuel tested are very good at these two temperature ranges. It is discovered that Cu ion and Fe involve in the thermal oxidization reactions of high flash point jet fuel and that Cu ion catalyzed and participated in oxidation, while Fe ion only acted as a catalyst to promote the oxidation and accelerate the deposition of the unstable compounds in the fuel.