The Qin Dynasty adopted the "General Theory of Five Virtues", which believed that the emperor's virtue was based on soil and advocated yellow; the Xia Dynasty's virtue was based on wood and advocated green; Yin dynasty was Jinde, advocating white; Zhou Wenwang wins gold with fire, and the color is still red; Qin ruled the world with water virtue, and the color was black. When Liu Bang founded the Han Dynasty, the clothes made in the Qin Dynasty were still black at the beginning of the Han Dynasty.