Abstract: In this paper a new concept for high cycle fatigue design-Intensity of Stress Field Method (ISF Method) is suggested by the authors. It is reasonable to assume that the macroscopic mechanics characteristics, which determines initiation and propagation of fatigue cracks, is the local stress-strain field around the maximum peak stress point, such field has a definite range. Here, the authors give a new mechanics parameter-the effective intensity of stress field σ(RD), which is used to represent quantitatively the intensity of local stress field and can be used as a macroscopic criterion for the estimation of high cycle fatigue life, since it appropriately represents the comprehensive effect of peak stress σ and stress gradients in different direction around the peak dσ/dx I(I=1，2-n)and to a certain extent represents the accumulation of deformation energy in this region.