The 7050 aluminum alloy is processed by laser shock processing (LSP) with high energy high repetition rate Nd:glass laser. After LSP with the unchanged pump power and different amplified spontaneous emissions (ASE),the surface residual stress of 7050 aluminum alloy is measured by using X-ray diffraction (XRD) technology. Results show that there is a certain relationship between ASE and the surface residual stress of aluminum alloy after LSP with unchanged pump power. With the increase of ASE,the compressive residual stress of the sample surface gradually decreases. When ASE increases to 16.20 J,the absorbing layer (aluminum foil) has been completely molten,and the effective pulse directly impactes aluminum surface and generates 21 MPa tensile residual stress which directly affects the effect of LSP on 7050 aluminum alloy.