Liu Bei, whose map of the Three Kingdoms is in Jingzhou, went to Shu to help Liu Zhang resist the invasion of Zhang Lu and Cao Cao at the invitation of Liu Zhang, the owner of the state. Liu Bei verbally promised, but after entering Shu, he kept buying people's hearts. The two sides finally broke up in 2 12, and Liu Bei transferred troops to Liu Zhang in Chengdu. Although Pang Tong, a military adviser, was killed halfway, Liu Zhang was successfully forced to surrender in 2 14, and Liu Bei successfully entered Yizhou, leaving Guan Yu to guard Jingzhou. At the same time, Cao Cao went south to attack Sun Quan, and finally both sides retreated.

In 2 15, Cao Cao quickly got Hanzhong. At the same time, Sun Liu and his two families began to compete for the ownership of Jingzhou, and the two armies confronted each other. However, Liu Bei learned that Cao Cao was in Hanzhong, endangering the security of Shu, so he shared Jingzhou with Sun Quan and returned to Yizhou, but the relationship between the two sides deteriorated. In 2 16, Cao Cao took office in Wang Wei. A year later, Liu Bei attacked Hanzhong, but Cao Cao's generals rebelled. Sun Quan also attacked Hefei, and Hanzhong successfully fell into the hands of Liu Bei. Although Cao Cao sent troops to recapture it, it failed. In 2 19, Liu Bei proclaimed himself king of Hanzhong.

In the same year, Guan Yu led the Jingzhou army to attack Wei in the north, but Monroe, who had just succeeded Lu Su in the main battle, raided Jingzhou and captured Guan Yu alive. In 220, Cao Cao died, Cao Pi ascended the throne, forcing Emperor Xian of Han to abdicate, and the founding of the country was Wei; 22 1 year, Liu Bei proclaimed himself emperor in Chengdu, with the title of Han; Sun Quan became a vassal of Wei State, and Cao Pi named Sun Quan the king of Wu, plus nine tin. In the same year, Liu Bei crusaded against Sun Quan in the name of revenge against Guan Yu, and Sun Quan sent Lu Xun instead of Monroe. As a result, Liu Bei suffered a fiasco and died in Baidicheng soon (see the Battle of Yiling for details). In 223, when he ascended the throne, Shu and Wu formed an alliance again, and finally formed a tripartite confrontation with China. In 229, the prince and grandson of Soochow rose and established Wu.