With low-hydroxyl acrylic resin as the main composition of the paint film,selected nano iron oxide pigment,a high quality nano-iron oxide coating was prepared through selective research on different types of wetting dispersants and functional additives of polyacrylic acid esters,fatty acid modified carboxylate and special block copolymer.The high quality nano-iron oxide coating has strong coloring power,high light retention,colorful,high color,operational strength,energy-efficient,is of positive significance to promote the rapid development of the current automobile painting industry.