In order to scientifically distinguish military and civil aero-engine airworthiness management and argument the airworthiness safety management, this paper creatively implements the system engineering IPO model on Airworthiness Management, which premeditates the Airworthiness Management as a supporting process in Systems Engineering, and concentrates on Airworthiness Management IPO model based on system engineering, It identifies the distinction on military and civil aero-engine by means of analyzing Airworthiness Management IPO model five elements which are inputs, outputs, controls, enables and activities, . Identically, both field Airworthiness Management are targeting on aero-engine safety which ascertained by comprehensive and integrated process control management. Meanwhile, there are distinguishment between military and civil airworthiness management, such as safety objectives, administration organization, standards/regulations, dispatch and assignment mode, supervision methods and etc. Furthermore, this paper surfaces out reference opinions on airworthiness management development for military and civil aero-engine after studying the specific requirements.