The influence of laser shock-processing (LSP) parameeters on the fatigue life of aluminum alloy 2024-T62 is described. If the duration of a laser is 50 ns, there is a heat damage on the LSP area of the specimen surface, and there is no improvemet on the fatigue life of metal. If the duration is 13 ns, there is no apparent plastic deformation, and there is a little improvement on the fatigue life. If the duration is 30 ns, on the surface of the specimen there is a densified hollow LSP area that is very shiny, and the fatigue life is increased greatly. With 95% confidence, the fatigue life of LSP specimen is 4.2～8.1 times larger than the unprocessed specimen.