Abstract: It is summaried briefly that composition of fatigue life for notched components, define of notch fatigue crack initiation size, local stress estimate method of notch fatigue life, main factors affected initiation life Ni, research status of fatigue life for notch and fatigue crack initiation life for sharp notch. A new descriptive parameter ΔK/ρ1/2 for initiation life Ni and a method to estimate Ni are introduced. At last the mainly decisive parameters of notch fatigue crack initiation life and relationship between them as well as future trend are pointed out.