Existing music-color synesthesia projects fundamentally focus on musical pitch and color, but seldom touch on music structure. This article proposes a systematic color visualization method of visual language based on music-color synesthesia. Not only does it involve pitch-color with timbres of various instruments but also adopts musical elements (even structures) in plastic units of color composition. The author established a metaphorical language of musical color based on the synesthesia theory. Quantizing-oriented as this language is, generative art and interactive system of color can be developed. It could also be applied in visualized music education and as a synesthetic performance aid.