Color coated steel plate, referred to as color coated plate, also known as color steel plate or color plate in the industry, is a product made of cold-rolled steel plate, galvanized steel plate or aluminum plate as the base plate, after surface pretreatment, then coating in a continuous way, and finally baking and cooling. With light weight, beautiful appearance and good anti-corrosion performance, color coated plate is widely used in construction, shipbuilding, vehicle manufacturing, furniture, electrical, decoration and other industries.Since 1935, the first continuous coated steel line was established in the United States, color coated steel has been widely used. At present, its production mode basically uses the production process of solvent coating roller coating. The biggest advantage of the production process is that it can be coated uniformly and at high speed to achieve large-scale production, so as to meet the large demand of the economic development for color coated plates. However, there are serious pollution problems in the way of roller coating with solvent coating, which contains volatile benzene, toluene, xylene, butyl acetate, acetone and other irritant toxic substances. Since the implementation of "the most stringent air pollution prevention and control law in history" in 2016, the color coated plate industry has received close attention. Why is the pollution so serious? How can we improve and avoid it? We should start from its own characteristics and production technology.