在飞船推进系统的物理和数学模型的基础上，研究了基于模型的故障诊断方法在飞船推进系统中的应用。该方法是某飞船推进系统状态监测与故障诊断专家系统中的关键技术之一。仿真结果表明，这项技术的提出和应用使得根据系统模型对推进系统的不可预知故障进行监测和诊断成为可能。 Based on the physical and mathematical models of spacecraft propulsion system, the application of model-based fault diagnosis in spacecraft propulsion system is studied. The method is one of the key technologies in the state monitoring and fault diagnosis expert system of a spacecraft propulsion system. The simulation results show that the proposed technology and application make it possible to monitor and diagnose the unpredictable fault of the propulsion system according to the system model.