Abstract: In order to solve the problem of quality stability of blended marine fuel oil products due to the poor compatibility of the feedstock, based on the compatibility principle, the matching proportion of each feedstock was calculated as the limiting condition of the fuel oil formula calculation, and then the optimized formula was obtained by taking the low cost as the objective function. The results showed that compared with the empirical formula, the optimized formula could improve the stability of the blended fuel oil, the spot test results of the fresh samples (0d) prepared by the optimized formula and the samples left for 15 days（15d）showed that the new samples had better stability, the gradient density difference of the blended samples (0d and 15d) was less than 10 kg/m³, and the spot test results were 2 grades. The fuel oil properties were stable after long-term storage.

Key words: marine fuel oil, stability, compatibility, optimization method