Spray room plus rotary spraying is a kind of spraying method high in efficiency, wide in scope of application and low in cost. The workpieces can be transmitted around the rotary cup along tracks through aerial line. The rotary cup can work up and down according to the actual demand of workpiece. The large workpiece can be coated in the form of aerial transmission, which is a general but practical method. With experience of many years in manufacture of transmission equipment, we can be in our element in such a field.