In order to solve the problem that long time of fault location and low efficiency of fault-clearing for a certain airplane' s missile-lauch channel, a fault diagnosis expert system is designed and developed. The expert system is based on the method of fault tree and expert system diagnosis to study the problem. According to the structure of systematic fault tree, fault repository was established. The RBR inference mechanism is adopted to the fault diagnosis. Practical application shows that the expert system can improve the efficiency of missile - lauch channel fault diagnosis and reduce the fault-clearing strength of maintance crew.%针对某型飞机导弹发射通道故障定位周期长和排除效率低的问题,综合应用故障树分析法和专家系统分析法,设计并开发了某型飞机导弹发射通道故障诊断专家系统；该系统按照故障树结构建立故障知识库,采用基于规则推理(Rule- Based Reasoning,简称RBR)的推理策略进行故障原因的推理与诊断；通过外场和内场使用表明,该系统提高了导弹发射通道的故障诊断效率,减轻了部队维护人员的排故强度.
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