The latest applications of laser shock processing were summarized in this paper,and laser peening with water confined layer has been applied to Ti6Al4V titanium alloy using Nd:glass pulse laser.The profile of plastic deformation and residual stresses on metal surface were studied with different laser power density.The investigation results show that peak depth of plastic deformation is in linear proportion to laser power density (5.75GW/cm2 to 9.5 GW/cm2),and maximal surface compressive residual stress is up to 375MPa at 8.25GW/cm2.It was ensured that the compressive residual stress field related to laser power density and shocked times.As spot overlapping ratio of 33%,the circle spot can get a relative smooth surface.Almen strip with thickness 2.5mm was shocked as the preliminary verification test of residual stresses,and it is shown that excessive peening times is unavailable to thin-wall parts just as edge of fan blades. The latest applications of laser shock processing were summarized in this paper, and laser peening with water confined layer has been applied to Ti6Al4V titanium alloy using Nd: glass pulse laser. The profile of plastic deformation and residual stresses on metal surfaces were studied with different laser power density. The investigation results show that peak depth of plastic deformation is in linear proportion to laser power density (5.75 GW / cm2 to 9.5 GW / cm2), and maximal surface compressive residual stress is up to 375 MPa at 8.25 GW / cm2.It was ensured that the compressive residual stress field related to laser power density and shocked times. As spot overlapping ratio of 33%, the circle spot can get a relative smooth surface .Almen strip with thickness 2.5mm was shocked as the preliminary verification test of residual stresses, and it is shown that excessive peening times is unavailable to thin-wall parts just as edge of fan blades.