Computational fluid dynamics (CFD) was adopted to investigate the effects of mass flow rate difference on nacelle outer surface pressure coefficient distribution.Inverse design optimization technique was used in engine nacelle lip correction in order to adjust the turbofan propulsion simulators(TPS) outer surface pressure distribution to make it identical with that of the real engine.The engine nacelle lip inverse design method can be used in 2.4 m transonic wind tunnel to improve jet engine flow simulation test accuracy.