Abstract: The effect of transition metal ions on thermal oxidation stability of jet fuel was investigated. Jet fuels with different concentration copper, iron and zinc using their naphthenates as metal precursors were used. The test results indicate that the existence of transition ions of copper, iron and zinc appreciably affects the dynamic thermal oxidation stability. The impact extent on dynamic thermal oxidation stability of jet fuels follows the sequence: copper＞iron＞zinc. The results are benefit to prevent jet fuel to be contaminated by metal ions in the production and transportation.