Engine Flight L oad Reliability Analysis”is a special reliablity re- search on the subject of engine integral load chart based on“JX/TJ(Trubojet) X Engine Flight Load Mesurement”.This paper makes full scale statistics and analysis on a greatnum- ber of data obtained form the actual measurements of flighttesting and quite a number of da- ta collected from flight- line service.Atheorticalresearch has been made on application of dou- ble design works to engine low cycle fatigue life calculation and testing.