A reliability design method is presented for fatigue strength of turbine blades.The method considers static stresses

dynamic stresses and the blade endurance strength as random variables.The scatter effects of the centrifugal tensile stress

the centrifugal bending stress and the gas bending stress are taken into consideration when the distribution parameters of static stresses are determined.The scatter effects of the static natural frequency

the dynamic natural frequency

the stimulus and the amplification factor are considered as the distribution parameters of dynamic stresses are determined.The distribution parameters of the blade endurance strength are determined under the condition that the scatter effects of the corrosion correction factor

the surface quality correction factor

the stress concentration correction factor

the dimension correction factor and the material fatigue limit are taken into account.The distribution parameters of the fatigue stress and the fatigue strength for turbine blades are obtained by the plotting method from the blade endurance strength graphs.The reliability of turbine blades can be estimated in the designing stage by use of interference models for fatigue stress distribution and fatigue strength distribution

which provides a scientific basis for designers to analyze and improve reliability of the turbine blades.