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Preventive maintenance is the main measure to restore and maintain the safety and reliability of the aircraft, and its optimization as a common concern is concerned by both aircraft manufacturers and users. The international mainstream preventive maintenance task optimization methods and their applicable objects are investigated. Based on the S4000P ISMO (in-service maintenance optimization) process suitable for equipment, the characteristics of military aircraft is combined to perform the adjustment and personalized design for the original process, and construct the logic process of preventive maintenance task optimization. The results show that the task optimization process can be used for the optimization analysis of military aircraft preventive maintenance task.