In this paper,the effects of curing agent type,substrate type and adhesion promoter on the adhesion of epoxy resin primers with two molecular weights were studied.The results show that different curing agent system,the excellent degree of adhesion of paint film is:epoxy polyurethane system>large molecular weight epoxy polyamide system≥small molecular weight epoxy polyamide system≥epoxy modified lipopyclic amine system.For common base material systems,the study showed that the adhesion of epoxy primer was the best on anodized sulfuric acid aluminum plate.The adhesion of the paint film can be improved to a certain extent by adding adhesion promoter,and the performance of the adhesion on the same substrate is also different.