基于液体火箭发动机故障诊断方法实时验证的需求，考虑目前微处理器的技术水平，通过对发动机全阶非线性动态数学模型合理的折衷处理，建立了发动机降阶非线性模型，发展了基于该模型的实时故障仿真计算方法及仿真软件系统。仿真计算结果和实践表明，该模型在精确性、实时性等方面可以满足实时性验证的要求；实现的仿真软件系统具有良好的汉化人机交互界面，可操作性好，移植、维护、升级方便。 Based on the real-time verification of the liquid rocket engine fault diagnosis method, considering the current state of the art of microprocessor technology, a reduced order non-linear model of the engine is established through a reasonable trade-off of the nonlinear dynamic mathematical model of the engine. Based on this model Real-time fault simulation and simulation software system. The simulation results and practice show that the model can meet the requirements of real-time verification in terms of accuracy and real-time performance. The simulation software has a good man-machine interface, good operability, easy to transplant, maintain and upgrade .