The printing and dyeing industry had existed in the Shang and Zhou Dynasties, and the dyeing technology was constantly improved. In the palace handicraft workshop, there are full-time officials "dyeing people" and "palm dyeing grass" to manage dyeing production. The color is increasing. The Book of Songs mentions the color of fabrics, such as "green in clothes and yellow in clothing", "green in clothing and yellow in clothing", "blue in clothing", and "black in clothing and yellow in clothing". The dyeing technology of the Han Dynasty reached a fairly high level.