The basis and steps of color matching: the overwhelming number of color matching is based on the color card or standard color board made according to the spectral color. If the color card is not made by the near spectral color, it can not be used as the standard, but it can only be used as a reference. If it's a standard color palette, it is necessary to first find the name or code number of the mixed color of the paint and pigment in the standard color card, so we need to allocate the hue, lightness and purity of the color. Before color matching, we need to accurately judge and identify the main color of the main color to be allocated, that is, the background color. We need to match several kinds of colors, and distinguish the order between the main and secondary matches. After the color is clearly identified, the selection and preparation of the color material can be made. In order to match the color containers and tools, select the suitable color matching places with standard color cards or templates, with standard natural light or light source, and match standard with color standard.