The pressure and temperature of air flow can be increased by aero engine, so the application of aero engine in supersonic ejector system is possible. The effects of air source on ejector performance and the effects of bleeding on aero engine performance were analyzed. And 3 types of aero engine layout in supersonic ejector system were presented. According to the requirements of a supersonic ejector system, the performance parameters of all 3 types of aero engine layout were calculated. The calculation results indicate that when the pressure of the upstream gas is 0.044×10⁵ Pa and 0.029 3×10⁵ Pa, aero engine can directly discharge the upstream gas or be used as the driving gas source for the supersonic ejector system by reasonable selecting the engine layout and working parameters.