Dalian shot blasting selects appropriate shot material, performance (hardness) and size. When the ejection speed is constant, the kinetic energy of the large projectile is large, which is conducive to the impact and removal of large impurities. The cleaning effect is good, but the surface quality of the casting is not good enough; Small projectiles have small kinetic energy and can be used to remove small impurities. The surface quality of castings is good, but the cleaning efficiency is low. Stainless steel shot can be used for aluminum alloy die casting, and the size of shot can be selected from 0.1mm-0.3mm. The product has bright surface, fine texture, no discoloration, strong corrosion resistance and good coating adhesion.