"The Biography of Zhouyi Cohesion" said: "The Bao family didn't write it. It was written by Shen Nong Jia. No Shennong, no Huangdi, no Yao and Shun. " Since then, many historical books have almost unanimously adopted this view: Yan Di and the Yellow Emperor have a continuous relationship. "Han Shu" and "White Tiger Yi Tong" are almost all recorded in the original text: "Fu didn't, Shen Nong wrote it. No Shennong, no Huangdi, no Yao and Shun. " Yue Jue Ji Shu Ni Nei Jing said: "Emperor Yan has the world to pass on the Yellow Emperor." Cai Yong in the Eastern Han Dynasty wrote "Arbitrariness": "The Book of Changes says: The emperor was surprised. Earthquake, wood also. Yanmi's family began to rule the world with Mude. Wood makes a fire, so it is not a sacrifice, and Shennong is on fire. Fire gives birth to earth, Shennong does not give birth, and the Yellow Emperor followed it with earth virtue. Gold was born in the soil, so the Yellow Emperor didn't. The Shao Hao family followed it and gave birth to Jinde. Gold begets water, so less Hao Zhi, Zhuan Xu followed with water virtue. Aquatic wood, so Zhuan Xu's family disappeared, and Di Ku's family followed Mulder. Wood makes a fire. So, Di Ku's family didn't, and Emperor Yao's family followed suit. Fire gives birth to earth, and Emperor Shun followed it with earth virtue. Gold was born in the soil, so Yu Xia's family followed it into the gold. Gold begets water, so Tang Yin takes water as its virtue. Aquatic wood, so Wu Zhou followed it with Mudd. Wood makes a fire, and Gaozu follows it with fire virtue. " Here, Cai Yong used five elements to explain the change of dynasties, from Fuxi to Han Dynasty. It can also be seen that in the Eastern Han Dynasty, the inheritance relationship between Yan and Huang was not controversial, but consistent.