Aero-engine has complex structure, harsh working conditions and poor working conditions, and the failure of aerodynamic, structural and accessory systems are frequent, which affects the engine's reliability and life and will affect flight safety due to the serious failure. This paper systematically analyzes and studies the major factors affecting the life, and introduces the life given and life extension methods with the domestic and foreign engine examples.%航空发动机结构复杂、工作条件严苛、工作环境恶劣，气动、结构和附件系统方面的故障频发，影响发动机的可靠性和寿命，严重的故障还将影响飞行安全。本文系统地分析和研究了影响寿命的主要因素，并以国内外发动机为例，简单介绍发动机定寿延寿方法。
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