Under the order of Yao, the ministers formulated the initial calendar according to the law of sunrise and sunset and the distribution of stars on the whole week, and guided people's production and migration according to the solar terms. The length of a year is 366 days, and leap months are set to adjust the four seasons.

As Yao grew older, he discussed with his ministers about the successor. Some of the ministers came forward to elect Yu Shun. Yu Shun, named Chonghua, is a Yu people. Chonghua's family background is very poor. Although he is the descendant of emperor Zhuanxu, the fifth generation is a common people and is at the lower level of society.

Shun's experience was even more unfortunate. His father was a blind man and his mother died early. After Shun's biological mother died, he took a wife and gave birth to a son named Xiang. The old man had a bad mind, his stepmother had two sides, and his brother was arrogant and stubborn. Shun lived in a family environment of "stubborn father, noisy mother and proud elephant". However, Shun did not lose his son's way to his parents, was very filial, and was very friendly with his brother. For many years, he did not slack off. The old man preferred elephant, so in order to monopolize the family property, several people colluded with elephant mother and son, and they would want to kill Shun and then hurry; Shun fled in time when his family wanted to harm him; After a slight improvement, he immediately returned to them and helped them as much as possible. His life experience was so unfortunate and the environment was so bad, but shun could show extraordinary morality and deal with family relations well.

Although Shun is regarded as a thorn in the eye at home, he has no resentment against his parents and brother. He returns good for bad. As long as his family has any requirements, he will try his best to meet them. Shun cultivated in Lishan, and Lishan people gave him land one after another; When he went to Leize to catch fish, master Leize gave him a place to live. Wherever Shun lived, local people came in admiration. They lived together in one year and became a city in two years. In three years, Yao heard that the minister promoted Shun, so he married his two daughters, e Huang and Nu Ying, to Chonghua, and beat around the Bush from his daughter to investigate Shun's character. Yao was very satisfied with the results of the final investigation, so Shun was specially responsible for educating the five ethics of the human race: father righteousness, mother kindness, brother friends, brother Gong and son filial piety. After Shun's enlightenment, the moral and folk customs of the human race gradually changed.

Later, Yao asked Shun to participate in political affairs, manage all officials, receive guests and undergo various hardships. Shun not only handled political affairs in an orderly manner, but also improved his employment.

After many tests, Shun was finally recognized by Yao. So Yao wanted to give shun the Zen position, but shun felt that his reputation and virtue were not enough and was unwilling to accept it. Yao had to let him temporarily perform the duties of the emperor. If God did not let Shun succeed, it would show something.