Ceramic shot peening using different intensities was applied on grinded surface of FGH96 powder metallurgy superalloy to research its effect on fatigue performance stress-concentration sensitivity. The fatigue tests and surface integrity statues were characterized. The results show that fatigue limit of grinding declines from 583MPa to 465MPa at 650 ℃ when the stress concentration factor increases from Kt=1 to Kt=1.7. Shot peening using high intensity makes the Kt=1.7 fatigue limit edge up to 530MPa while low intensity has no gain for the Kt=1.7 fatigue limit. High intensity leads to the elimination of grinding marks

an increscent average roughness and an 100μm-depth residual stress profile

therefore the 600MPa fatigue cracks are initiated at the subsurface in a single source fatigue model. By contrast

low intensity hardly makes marks eliminated and the fatigue cracks are initiated at the surface in multiple sources fatigue model. The research proves that the suitable shot peening method can minish the weaken effect to fatigue performance by structural stress-concentration.