Laser shot peening forming is a novel technology, which employs residual stress induced by intense laser to shape precisely the plate. In this paper, the aeronautic aluminum alloy LY12CZ was selected as an object to research experimentally the magnitude of deformation versus numbers of laser shot peening, and surface quality in laser shot zone was also investigated. The specimen was impacted along its centerline by the high-power, short-duration pulses laser. The experimental results show that the arc height and hardness becomes greater with numbers of shot peening increasing and eventually arrives to saturated state, and surface roughness after laser shot peening decreases slightly and dislocation density increases greatly, which indicates that the laser shot peening is a technique combining laser shock processing and metal forming.