In the Yuan Dynasty, "the second day of February" was called the day when the dragon looked up. February of the lunar calendar has entered the mid-spring season, and "February 2" is between the "rain", "shock" and "vernal equinox" of the 24 solar terms. Since ancient times, people have celebrated dragons on the day of "Dragon's Head Raised" in mid-spring, in order to pray for dragons to eliminate disasters and bless them, with good weather and abundant crops.

The second day of the second lunar month is not only the "Dragon Head-raising Festival", but also the "Social Day Festival" for the birthday of the Earth God. February 2nd in the south (the fifth day after beginning of spring in ancient times) still follows the custom of offering sacrifices to the land gods. Such as Zhejiang, Fujian, Guangdong, Guangxi and other regions, there are both customs similar to the Dragon Head Festival and the new "February 2" custom, which mainly worships the land gods.

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The formation process of the dragon is the process of national unity, which was basically completed when it was merged into Tang Yao, and the image of the dragon was determined. According to the chronicle of bamboo books (bamboo slips unearthed from the tomb of King Wei Anli in the Eastern Jin Dynasty, avoiding the burning of books by Qin Shihuang).

Yaosheng was born in Yiqi Mountain (in Shunping County, 40km southwest of Baoding), and Yaomuqing is an Chen Feng tribe, born in the fields of Dou Wei, which is now Tangxian and Wang Du in the southwest of Baoding. There is a Du Qing seven kilometers east of Tangxian County, which is said to be Yaomu's residence. There is Yaomu Tomb in Wangdu County and Yao Di Temple in Beiguan.

When Huang Yun was born, he often covered Du Qing, and when he was an adult, the dragon often followed him ... The evil wind closed, and the red dragon was pregnant. Yao was born in (that is, Yiqishan) in November. Today, Yaomudong in Yiqi Mountain is Yao's birthplace. This shows that Chilong lived near Yiqi Mountain at that time, which deepened the flesh-and-blood ties between the dragon and the Chinese nation. It also shows that the descendants of the dragon have been recognized by the world in Yao Dynasty.