At the beginning, he was named king of Jiaodong, and at the age of seven, he became the crown prince. He succeeded to the throne three years ago (14 1 year ago). In order to strengthen centralization, a commendation order was issued, and the left official law and the auxiliary benefit law were formulated, stipulating that Wang Wei, a vassal, had to pay food and clothing taxes and was not allowed to participate in politics. Recruit talents in an eclectic way and promote talented people to be waiters of consultants. The power of the prime minister was reduced, and the political system of North Korea (China) was formed by relying on cronies and cronies to participate in decision-making. In order to strengthen the control of counties, thirteen counties were established. In order to solve the financial difficulties, the monetary system was reformed, counties and States were forbidden to cast money, and the system of salt and iron official operation and even loss was implemented. Issue liquidation and condemnation orders and impose heavy taxes on businessmen. Establish a formal inspection system, so that counties and counties can raise filial piety, scholar, virtue and righteousness. Implement the cultural policy of "ousting a hundred schools of thought and respecting Confucianism alone", set up a doctor of the Five Classics, and build a imperial academy in Chang 'an, the capital, so that all counties and countries have academic officers. Because of superstitious belief in immortals, and keen to retreat and worship the suburbs, I have traveled many places and spent a lot of money. In the second year of Yuan Shuo (BC 127), Wei Qing and Huo Qubing were sent to attack the Huns for many times, forcing them to migrate to Mobei. Zhang Qian was ordered to go to the Western Regions to communicate with all ethnic groups in the Western Regions. He also conquered Fujian and Vietnam, Dong 'ou, South Vietnam and Wei's Korea, managed Southwest Yi and set up counties there.
In his later years in power, class contradictions deepened day by day, with two million refugees in Kanto, and peasant uprisings broke out in many places. There was a "witch disaster" in the imperial court, which led to easy suicide. Zheng He wrote to the platform four years ago (89 years ago) and rejected Sang Hongyang's suggestion of raising people and farming. He died in the second year of the Yuan Dynasty (87 years ago), and his eight-year-old son Liu Fuling was made a prince before his death. Emperor posthumous title Sejong, filial piety, was buried in Maoling.