Abstract: Integration Order Descending Method (IODM) is a new approximate method for solving the mathematical problems in the reliability.There are some difficultes to solve the engineering problems with the IODM.This paper shows how to use IODM for this purpose and applies it to calculating the creep reliability of an aeroengine turbine disc.This paper also presents the loads that have been considered in calculaion of the turbine disk creep with ADZNA programm.