Abstract: An aero-engine can be regarded as a subsystem of the aircraft system. It is obvious that engine performances, weight and dimensions have a strong effect on the aircraft flight performances. For a given flight mission, the optimal engine scheme must be able to meet the flight requirements with the greatest possibility. From the viewpoint of system engineering, a method for integrated selection of the optimal engine cycle parameters and the control scheme is proposed, which takes the matching and interaction between the engine and the aircraft. A rapid method for predicting turbojet or turbofan engine off-design performances was adopted and an empirical formula estimating the engine weight was developed.An optimization of an augmented engine scheme meeting the requirements of a modification has been accomplished as an example. The results show that the optimum cycle parameters and the control scheme are quite different if the mission, the requirements of modification or the technical constraints are varied. Therefore, the integrated selection of engine cycle parameters is of great importance.