Mold is the mother of industry, which has great advantages in efficient batch production, but with the increasingly stringent requirements of mold precision, structural complexity, production cycle and cost, traditional mold manufacturing can not fully meet the market demand. Among the many new mold processing technologies, metal 3D printing technology introduces the concept of increasing material manufacturing into the mold industry, and brings a new development direction for mold manufacturing with its unique technical advantages. among them, the conformal waterway is the most common application of mold 3D printing manufacturing.