The main factors that affect the fatigue limit of parts' materials are stress concentration, size, surface quality, and environmental conditions. Therefore, the main measures to improve the life of parts are: ① Properly design the structure of parts to reduce stress concentration; ② Adopt processed or surface strengthening treatment to improve the working surface quality of parts; ③ Reasonably select matching materials, lubricants, and lubrication methods for friction pairs to improve the wear resistance of parts; ④ Select corrosion resistant materials to manufacture parts that work in corrosive media; ⑤ Use heat treatment to improve the mechanical properties of the part material, or use processes such as rolling and shot peening to generate favorable residual stresses on the surface of the part