Abstract: In the design of die casting mould, more consideration is given to the curability of the mould itself, such as runner, overflow, temperature, ejection, etc. However, if the technological requirements of subsequent casting machining are not well considered in the design stage of the mould, the machining difficulty of the casting will increase. The production efficiency is reduced, which ultimately affects the machining production cost. Therefore, in the die design stage, not only the die casting process should be considered, but also the needs of subsequent machining should be considered more, so as to effectively optimize the die design scheme and improve the overall economic benefits of die castings. Die-casting has a series of characteristics such as high production efficiency, low cost, excellent appearance quality and long die life. In production,