In Dalian sand blasting and shot blasting processing, forging parts are not only cleaned by shot blasting, but also cleaned by roller first for large parts, that is, the riser of the casting parts is cut off and rolled in the roller. Parts collide with each other in the roller, and most of the sand on the surface is cleaned first before shot blasting or shot blasting. The research shows that in terms of damage, when there is tensile stress on the surface of metal materials, it is much easier than compressive stress. When there is compressive stress on the surface, the fatigue life of materials is greatly improved. Therefore, shot peening is usually used to form surface compressive stress for parts prone to fatigue fracture such as shafts, so as to improve the service life of products. In addition, metal materials are very sensitive to tension, which is the reason why the tensile strength of materials is much lower than the compressive strength, This is also the reason why metal materials normally use tensile strength (yield, tensile) to show data function. The steel plate working surface of our daily car is strengthened by shot peening, which can significantly improve the fatigue strength of the material.