The loading spectrum is the foundation on which the life analysis of the aeroengine structure is discussed. The life usage consumption of turbine operating blade of some typical missile turbofan engine was predicted by working data processing. The life consumption models was established on which the working data was processed and the loading spectrum of the aeroengine was gained.Distribution of life consumption of the blade was discussed by the Weibull distribution model, and based on which reliability anglicizing models was established. The reliability methods of calculating the usage life by using the middle rank of incomplete life data in the statistical field were introduced. The life of the engine gradually develops with the increases of the reliability growth. Considering the time effect of the sample, the dynamic Weibull distribution model embodies the reliability growth of this engine. The analytical methods were used to estimate the engine′s reliability at research stage.