Aircraft structural life envelope (ASLE) is a boundary line o f fatigue life and calendar life while aircrafts in service. Based on the concep t of ASLE, and considering the interaction between fatigue life and calendar lif e, a method of determining ASLE by pre-corrosion fatigue tests is proposed as c o rrosion-affecting coefficient method. A residual life prediction method for cor r osion-fatigue critical components of aircraft metal structures under typical en v ironment is established, and a residual life prediction example under condition of variable flight intensities is presented. The establishment of ASLE will pave the way for the structural life (i.e. fatigue life and calendar life) supervisi on for individual aircraft.