Abstract: A method for estimating life cycle cost of aircraft turbine engine manufactured in China is provided on the basis of a statistic technology and a definition of life cycle cost ratio has been used.Changes in thrust,specific fuel consumption and life cycle cost have been calculated when thermodynamic parameters(π  k,T  3 and T  af )and mean time between overhauls of the engine increase.It was found that there was a marked growth of the engine thrust when T  3 increased,but life cycle cost ratio of the engine should,too,quickly grow.In order to make the growth of life cycle cost ratio acceptable for the Air Force,mean time between overhauls and total operation time of the engine must be lengthened.And a overhigh pressure ratio of the compresser often makes the thrust drop down and life cycle cost ratio grow up.