During storage, the outer color change of jet fuel may reveal that the inner quality has been changed. The relationship between the chemical composition and the main reaction routes of the colored component, gum compound and precipitation was studies. It is found that the colored component mainly gathered in adsorptive gum compound, while the colored component and the adsorptive gum were merely the intermediate products of oxidation process, whose production and consumption were in dynamic change. It is also found that the color could not be used as the judging standard of jet fuel quality, while the sediment formation tendency under some certain conditions may be the effective method to determine the quality of color changed jet fuel, and the method of controlling the quality of storage jet fuel by static thermal stability test and ultraviolet spectrophotometry test is very important for solving the difficulty of using color changed jet fuel.
