Abstract: The process design method of sand mold low-pressure casting of red copper crystallizer was studied, focusing on the lifting pipe, pouring system, pouring process and sand mold design.The results show that the length of lifting pipe is 55 mm, the inner diameter is 70 mm and the wall thickness is 5.5 mm.The pouring system uses a straight ingate, which is directly injected into the cavity from the bottom of the casting.The middle large core adopts extended upper core head, the small hole core adopts the vertical core with lower core head. The height of the core head is 35 mm and 15 mm, and the corresponding bevel angle is 6°and 1°, respectively.