In order to obtain the optimum performance data of the extraction aircrew escape system, a relevant mathematical model is establised in this paper on the basis of operational principle of the system and different phases of the extraction ejection event. Through the simlation algorithm, this paper gives the power complement between the ejection gun and the extraction rocket and time intervals between the front and rear cockpit occupants escaping from the aircraft according preset ejection sequences. These data provide preliminary permance basis for general design of the aircrew escape system, and the techncial program is finalized.