The zodiac originated in that period.

From Shun Di, China began to use the "heavenly stems and earthly branches Chronology", which combines ten days' work with twelve branches. The method of zoological chronology originated from nomadic people in the west and north of ancient China.

The zodiac was first seen in The Book of Songs, the world's first collection of poems. "The Book of Songs Xiaoya Chegong Chapter" says: "At noon on an auspicious day, my horse is insufficient." The theory of the zodiac should be formed in the Han Dynasty at the latest, and the zodiac has been formed in the Eastern Han Dynasty. The use of the Chinese zodiac has appeared at least in the Southern and Northern Dynasties.

However, in the mid-1970s, thousands of bamboo slips were found in the cultural relics unearthed from Qin TombNo. 1 1 in Yunmeng Shuihudi, Hubei Province. This miracle proves that the zodiac was used during the Spring and Autumn Period and the Warring States Period. Because the Qin 1 1 tomb was in the thirtieth year of Qin Shihuang, that is, 2 17 BC.