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Fuel system as an integral function and security system of aircraft has major impact on the safety of aircraft. Aiming at the problem of failure diagnose, the model of aircraft fuel feeding system is built by fluid simulation software Flowmaster. The aircraft fuel system working at the condition of boost pump feeding, cross-feeding and gravity feeding are simulated. The fault mode of aircraft fuel feeding system is analyzed. The working conditions of several typical failures are simulated, and the results are analyzed. It shows that the fuel feeding system which is built by Flowmaster could simulate the aircraft fuel feeding system working at normal or failure conditions. The result provides a foundation for the failure diagnose of aircraft fuel feeding system. There is much engineering application value.