The Han Dynasty was divided into the Western Han Dynasty and the Eastern Han Dynasty, and was a powerful unified empire after the Qin Dynasty. In 202 BC, Gaozu Liu Bang founded the country, and the capital was Chang'an. After the reign of Wenjing, Emperor Liu Che of the Han Dynasty further promoted the cause of great unification, and reached its peak in the "Zhaoxuan Zhongxing". In the ninth year of AD, Wang Mang usurped power, and the Western Han Dynasty ended. In 25 years, Liu Xiu of the imperial family was proclaimed emperor, established the Eastern Han Dynasty, and set the capital Luoyang. Created the rule of Guangwu Zhongxing and Mingzhang, and all countries came to the dynasty. During the Han Dynasty, ethnic integration developed unprecedentedly, foreign exchanges were frequent, and the national strength and economy were relatively strong. Moreover, the unification of culture has laid the foundation for the social development of the Chinese nation for 2,000 years, and has made great contributions to the continuation and upright of Chinese civilization. The Han Dynasty lasted for more than 400 years. In 220, Chan was located in the reign of Cao Pi, the king of Wei, and the Eastern Han Dynasty ended.