With functional aids and deionized water,the heat-insulating medium coating is prepared by aqueous saturated polyester resin used as a film-forming host resin,the methyl etherified amino resin used as a curing agent,the aqueous aliphatic blocked polyisocyanate as an internal curing agent,titanium white powder,mica powder,potassium hexatitanate whisker and ceramic hollow microbeads as pigment fillers.Under the cooperation of the aqueous color paste,the heat-insulating top coating is prepared by titanium dioxide,heat shield,graphene and barium sulfate used as pigment fillers.The medium and surface matching coating has the advantages of environmental protection,good physical and chemical properties,and high heat insulation efficiency.