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With the development of mechanical-electro-hydraulic joint simulation technical, the fault diagnosis digital simulation system was constructed based on AMESim and MATLAB software, which realizes the function of fault simulation, injection and diagnosis simulation of electro-hydraulic system. Taking a typical hydraulic lifting circuit system as an object of study, the fault mode and diagnosis method were studied, the simulation model was established, and the demonstration and verification of fault injection and diagnosis process were completed. The results showed that the simulation system could be applied to fault injection and fault diagnosis simulation of similar systems, different working conditions and different fault modes, which greatly improves the reliability of hydraulic system design.