Color steel refers to color coated steel plate, color coated steel plate is a kind of steel plate with organic coating, with good corrosion resistance, bright colors, beautiful appearance, easy processing and forming and has the advantages of the original strength of the steel plate and lower cost, etc. Color coated steel plate is widely used in construction, home appliance and transportation industries. For the construction industry, it is mainly used in steel structure workshop, airport, warehouse and refrigeration and other industrial and commercial buildings, such as roof walls and doors, etc. The civil building using color coated steel plate is less.