Strengthening the important aerial aluminum alloy material, 7050T7451, 7050T7452 under different conditions by Laser Shock Processing ( LSP) technique with the device which is developed by ourselves and testing the residual compressive stress of LSP area. The comparing test results shows test piece will has very high residual compressive stress after LSP, the residual compressive stress can exceed -200MPa; After twice sequential repeated processing, the residual compressive stress will be increased over one - time than single processing; After twice sequential repeated processing on one side, the residual compressive stress of front side (the side was processed first) is equivalent to twice sequential repeated processing on both sides, and at the same time, after twice sequential repeated processing on both sides, the residual compressive stress of back side (the side was processed latter) is far less than front side. All above results are discovered through experiments first time, and have guide meaning to the practical engineering applications of LSP technique.At last,the corresponding analysis of surface strcture and testing of fatigue life were given.