Laser shock processing is a new technique for fasten holes and the key is how to set the parameters of laser shock processing (LSP).Finite element method has been used to predict the distribution of residual stress with different power density.FEA code ABAQUS is used as a platform to study the residual stress field with different power density.The result indicates that the residual stress distribution caused by different power density within 0~6 mm are basically uniform,the biggest residual compressive stress emerges in the hole edge,the impact region is not very different.In un-impacted side,there is only residual compressive stress,which is induced by the sheet metal′s deformation.With the increase of peak pressure,the residual compressive stress in hole inner wall is also increased,which also causes overlarge residual tensile stress near the center of sheet thickness direction,it is very adverse to improve the resistance of the fatigue performance.