Color matching in painting workshop is a process scheme of spraying and drying the color matching area behind the car covered with high temperature film. According to the relevant data, the process of color matching includes making mixed lines, locating tracing points, pasting contours, shielding protective films in non-color matching areas, and removing shielding objects. The polishing of color matching area and middle paint share a polishing room. According to the construction requirements of top paint, the processes of color paint spraying, drying, strong cooling and spot repair are carried out in the top paint line.