In order to research the influence of laser shock processing(LSP) on 2Cr13 steel′s impact toughness，2Cr13 martensite stainless steel was strengthened by laser shock processing.Impact toughness and residual stress were measured.The microstructure and fracture surface were observed as a function of laser shock processing parameters.The results show that the impact toughness increases as the laser power density increases when laser power density is within an appropriate range.The compressive residual stress is induced by laser shock processing.The micro-structure of the shock zone was fractured and studied.From the micrograph of the fracture surface,the morphologies exhibit brittle fracture.The dimple is increased with LSP,so the impact toughness is improved.