Colour coated galvalume sheet is a building material made of three-layer composite material, including substrate, zinc-aluminium alloy coating and organic coating.After surface degreasing, phosphating and complex salt treatment, it is coated with organic coating and baked. The material has a flat and beautiful appearance, light weight, corrosion resistance, long life, good thermal resistance performance, widely used in construction, transport, electric power, home appliances and other fields.