The accuracy of parts is affected by many factors, including materials, processing technology, processing equipment and so on. The first is the impact of materials. Different materials have different characteristics, and their parameters such as thermal expansion coefficient and hardness are different, which directly affect the precision of parts. The second is the influence of processing technology. Different processing technologies have different requirements for the accuracy of parts, so different processing technologies are required. Finally, the impact of processing equipment. Different processing equipment has different requirements for the accuracy of parts, so it is necessary to choose suitable equipment.