The Han Dynasty, divided into the Western Han Dynasty and the Eastern Han Dynasty, was a unified dynasty after the Qin Dynasty.

In 206 BC, Liu Bang sealed Hanwang, and then Chu and Han contended and won the establishment of the Western Han Dynasty. At the beginning of Han Dynasty, after the rebellion of King Zhao 'an and Zhu Lu was eliminated, the political situation tended to be stable. Emperor Wen of Han and Emperor Jing of Han successively recuperated and created the rule of Wenjing. After Emperor Wudi ascended the throne, it was called the prosperous time of Hanwu. By the time Emperor Xuandi of Han Dynasty, the national strength reached its peak, which was called filial piety. In 8 AD, Wang Mang usurped the Han Dynasty, the Western Han Dynasty perished, and an uprising broke out soon. In AD 25, Liu Xiu proclaimed himself emperor, established the Eastern Han Dynasty, made Luoyang its capital, unified the world, retired troops to support the people, and started a prosperous military. Emperor Han and he began to rule the right by following the frivolous and thin fu. After Emperor Han and he succeeded to the throne, the eternal prosperity was opened, and the national strength of the Eastern Han Dynasty reached its peak. There was a struggle between officials in the middle and late period, and the Yellow Scarf Uprising broke out in A.D. 184. Although the rebellion was wiped out, it led to local self-respect. After Dong Zhuo's rebellion, the Eastern Han Dynasty existed in name only. In 220 AD, Cao Pi usurped the Han Dynasty and the Eastern Han Dynasty perished.

At the end of the Qin Dynasty 209 years ago, due to the increasingly harsh laws, Chen Sheng and Guangwu finally broke out, and the six princes and old nobles in the pre-Qin period also took this opportunity to rejuvenate the country. In April, 2007, Xiang Yu, a descendant of Chu nobles, wiped out Qin Jun's main force in the Battle of Julu, while Liu Bang entered the customs and overthrew Qin Ting. Later, Xiang Yu honored Chu Huaiwang as the "righteous emperor" and enfeoffed the world alone, calling himself the "overlord of Chu" and Liu Bang as Hanwang. After that, the two armies began a four-year Chu-Han war. With the help of Xiao He, Han Xin and others, Liu Bang finally defeated Xiang Yu in the Battle of Gaixia, and formally proclaimed himself emperor in the first 202 years, with the title of "Han", and established the Western Han Dynasty.

In the 13th year of Jian 'an, Emperor Xian of the Han Dynasty removed the three officials, restored the prime minister, and Cao Cao became the prime minister, monopolizing power. Cao Cao invaded the south and was defeated by Sun Quan and Liu Bei in Battle of Red Cliffs. Cao Cao returned to the North Master. Soon Liu Bei took Jingzhou as the foundation and occupied Yizhou, and Cao Liusun's three-point world trend began to take shape. During this period, Emperor Xian of Han Dynasty was only a puppet emperor, and the real power was in the hands of Cao Cao. Cao Cao was first promoted to Gong Wei, and then to Wang Wei. Liu Bei was also promoted to the king of Hanzhong, and the Han Dynasty existed in name only.

In the first month of spring in the twenty-fifth year of Jian 'an (220), Cao Cao died of illness, and his prince Cao Pi succeeded to the prime minister of Han Dynasty and attacked Wang Wei. In November of the same year, Cao Pi forced Emperor Xian of Han to "abdicate" and ascend to the throne. The Eastern Han Dynasty ended, the Han Dynasty officially ended, and the Three Kingdoms period officially began.