以模糊规则集度量为核心，提出了一种液体火箭发动机故障诊断系统。利用模糊待检规则集与模糊参考规则集之间的度量结果为故障诊断逻辑，输出故障检测时间、故障分离时间、故障类型和故障程度。仿真研究表明：基于模糊规则集度量的故障诊断性能比较优越。 Taking the fuzzy rule set measure as the core, a liquid rocket engine fault diagnosis system is proposed. The measurement result between the fuzzy rule rule set and the fuzzy reference rule rule is the fault diagnosis logic, and outputs the fault detection time, the fault separation time, the fault type and the fault degree. Simulation results show that fault diagnosis based on fuzzy rule set metric has superior performance.