In order to analyze the oil systems characteristics and study the coperative working and design problems involving aero-engine

a general simulation block library for its components was developed in MATLAB/Simulink based on flow rate

pressure and heat transfer characteristics. Then a full-system simulation model was established

including supply

return， air and thermal system. Taking a certain turbofan engine and its oil system as example

the main working parameters of the oil system were calculated under high temperature taking off condition. Compared with the calculated values of Flowmaster model

the relative error was less than 3.8%. Through the extension ability of the full-system simulation model

a co-simulation with GasTurb engine model was successfully implemented and the oil systems design parameters were optimized through genetic algorithm. The highest temperature of return oil decreased by 4.12% by changing the oil supply ratio. This method can provided a reference for oil system design and improvement.