摘要： 无人机是无人驾驶飞机的简称，英文简称为UAV。随着无人机种类和数量的不断增加，事故发生的频率也在不断增高，在所有的事故中由起落架故障导致事故的占了很大比例。可靠性是衡量元器件或系统是否能安全工作的重要指标，但在我国对于无人机起落架的可靠性研究工作较少。本文首先介绍了无人机的发展情况及起落架对于整个系统的重要性，然后介绍了起落架的组成结构，最后应用基于FMECA的模糊贝叶斯网络可靠性分析方法对无人机起落架系统进行可靠性分析，找出关键子系统，为决策者提供决策依据，减少故障发生概率，保证无人机安全完成飞行任务。

Abstract： Unmanned Aerial Vehicle is short for Unmanned aircraft,English abbreviation for UAV.With the increasing number and variety of UAV,the frequency of accidents is increasing.A large proportion of accidents due to landing gear failure.Reliability is an important indicator to measure whether system or a component can work safely. However, there is less research on the reliability of UAV landing gear in our country.Firstly,this paper describes the development of UAV and the importance of landing gear to the entire system.Secondly,introducing the structure of the landing gear.Finally,applying FMECA-based fuzzy Bayesian network reliability analysis method to analyze the reliability of UAV landing gear system and finding out the key subsystems.The purpose is to provide a basis for the decision makers and reduce the probability of failure.Ultimately guarantee that the UAV will complete the mission safely. Key words：UAV;landing gear;FMECA;Reliability analysis