Color matching issue of (Color Computer-generated Holography, CCGH) is researched based on colorimetric principle. The conversion between color quantity in electronic display colorimetric system and amplitude of object light in CCGH colorimetric system is given. Firstly, the conversion between color quantities in electronic display and CCGH colorimetric system is discussed. Then, the conversion method for color quantity in the two colorimetric systems is given. Secondly, isochromatic transfer relationship of color quantity and amplitude of object light field is proposed. Thirdly, we chose a color image from PAL-RGB colorimetric system as an experimental object of CCGH. The experimental results demonstrate that our novel approach is feasible. The research of this paper will provide theoretical and technical basis for practical use of CCGH.