According to the experience of automobile pretreatment and cathodic electro-deposition line process management,a method of cathodic electro-deposition line process management is summarized.And this management method is formed into a model to reduce the difficulty of pretreatment and cathodic electro-deposition line process management for related practitioners at the beginning,and to provide a reference for improving the process management of pretreatment and cathodic electro-deposition line.