In the automobile manufacturing and construction machinery manufacturing process,the painting line is the junction of the welding line and the final assembly line,It is also a process to provide a beautiful appearance to the product.Energy consumption is larger because of more equipment in the painting line,which occupies for about 55% in the whole process.Especially,water-based paint or waste gas treatment equipment is used based on the environmental protection requirements are getting stricter and process improvement of painting line,which has increased part of the energy consumption on the original basis.Therefore,the equalization production of coating line is more important.