Strengthening the important aerial aluminum alloy material, 7050T7451, 7050T7452 by laser shock processing (LSP) technique with the home made device. Testing the fatigue life. σ_m-N curves which show the relation of fatigue stress level and fatigue life of material were given, the result showing, after LSP, fatigue life of 7050T7451 increases to 435% of non LSP sample under 67.3 MPa stress level, fatigue life of 7050T7452 increases to 518% of non LSP sample under 81.4 stress level. Also researching the mechanism of LSP on 7050 aerial A-alloy, the result shows the surface of the test piece has biggiesh residual compressive stress, and biggish internal dislocation density.