Objective To determine the prolong-life methods for the life-limited components of aircraft. Methods Based on the RCM theory, the necessity of the devices of life-limited components control was determined. It should be selected in accordance with the principles of endurance index to select appropriate endurance index. It should be selected the appropri-ate methods to prolong the life of components according to the characteristics of components and the applicability of prolong-life methods. Results The prolong life decision methods of aircraft life-limited components were worked out. Conclusion It can solve the problem of prolonging life of airborne equipment better by this decision.%目的：决策飞机有寿件延寿方法。方法通过 RCM 理论判断设备作为有寿件控制的必要性，对于有必要进行延寿的设备，需按照寿命指标的原则选取合适的寿命指标。根据设备的特点和延寿方法的适用性，选取适当的方法对其进行延寿。结果得出飞机有寿件延寿的决策方法。结论通过此决策方法能够较好地解决机载设备延寿的问题。
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