Abstract: To establishing a simple and rapid method for determining diesel oxidation stability, a new type of instrument was developed, the oxidation induction period and oxidation inflection point were used as the symbol of oxidation stability. By means of the single-factor test and orthogonal test, the factors that impact on the diesel oxidation stability are explored. The optimal experimental conditions for the new instrument are 140℃，and O2 pressure of 700kPa. Meanwhile, a correlation model between the filterable insoluble substance at 140°C and the symbol was established. The results showed that the oxidation inflection point can be used to predict the filterable insoluble substance at 140°C. The method has good repetition and differentiation and can be used for evaluation of diesel oxidation stability.

Key words: diesel, oxidation stability, orthogonal test, correlation