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Aiming at the heavy-lift LH2/LOX staged combustion cycle engine, the modular fault simulation method is used to simulate a kinds of typical engine faults, which lays foundation for the establishment of health monitoring system of liquid rocket engine. Firstly, the system structure and working process of the typical LH2/LOX staged combustion cycle engine are introduced. Secondly, Matlab/Simulink tool is used to build the module library of the main components of the engine system, and according to the engine structure and working process, the overall simulation model of the LH2/LOX staged combustion cycle engine is established. At last, many typical engine faults are simulated and analyzed ,and the visual interface is built by using Matlab GUI tools to realize the humanization of operation and implementation mode.