Laser peening can improve the fatigue life of the pore structure effectively,while fatigue growth is the main part of the fatigue life.Different stress levels affect the fatigue growth,so the effects of no shocked sample and shocked sample are different.Laser peening experiments are used to analyze fatigue growth of TC4-DT titanium alloy hole specimen under stress level.Results show that the increase of stress levels will lead to the increase of fatigue striation width.The change of stress level has greater effect on fatigue growth of specimens after laser peening,but the increase of stress level will reduce the gain of laser peening fatigue life.The applicable stress level should be controlled when laser shock processing parameters are constant.