Shot peening is a cold work process used to finish metal parts to prevent fatigue and stress corrosion failures and prolong product life for the part. Shot peening is the most economical and effective method of producing and making surface residual compressive stresses to increase the product life of treated metal parts.The impact of high-speed projectile flow on the metal surface causes a cyclic plastic strain layer on the surface, which leads to favorable changes in the microstructure of the metal surface and leads to the introduction of residual pressure stress field.Therefore, the fatigue fracture and stress corrosion fracture resistance of metal products can be improved to the reliability and durability of products.