With the rapid development of color coated plate industry, the development of color coated plate coatings with excellent performance to meet the needs of advanced and diversified products has become a research hotspot at home and abroad. Among them, the preparation of primer with good adhesion, flexibility and good compatibility with the top coat is very important to improve the performance of color plate coating. The product obtained by baking with the electro galvanized sheet as the substrate and coated with organic paint is the electro galvanized color coated sheet. Because the zinc layer of the electro galvanized sheet is thin and the zinc content is usually 20 / 20g / m2, the product is not suitable for making walls and roofs outdoors. However, due to its beautiful appearance and excellent processing performance, it can be mainly used for household appliances, acoustics, steel furniture, indoor decoration, etc.Due to many influencing factors, the preparation of primer is a complex process. Recently, domestic researchers have used orthogonal experiment to determine the influence of various factors on the performance of epoxy primer, so as to reasonably determine the best formula with less steps. The prepared paint film has obvious advantages of hardness and solvent resistance, and excellent adhesion. According to experts, they focused on six influencing factors: color base ratio, amount of crosslinking agent, catalyst, defoamer, surfactant reducing agent and wetting dispersant. The selected crosslinking curing agent is urea formaldehyde resin sm-526. The experiment shows that the amount of crosslinking curing agent has the greatest impact on the adhesion of the paint film, has a great impact on the bending and MEK wiping resistance, and has no significant impact on the hardness of the paint film. Because domestic coil coatings lag behind foreign products in variety and quality, Chinese manufacturers have to adopt expensive imported coatings when producing color plates, which greatly affects the development of color plate industry in China. Therefore, experts call on the domestic industry to break through the bottleneck of epoxy primer for color coated plate as soon as possible.