Based on the analysis of the aircraft structural life envelope (ASLE) under the baseline operational conditions, an approach of establishment of aircraft structural life envelope (ASLE) under nonbaseline operational conditions is presented. The method of service life supervision for individual aircraft structural system(SLSFIASS) under nonbaseline operational conditions is given. Taking the supervision of the time between the first and second overhauls for an aircraft structural system for example, the supervising methods and steps of SLSFIASS are demonstrated.