After Battle of Red Cliffs, Cao Cao dared not go south easily. Sun Quan's position in the middle and lower reaches of the Yangtze River has been consolidated. Liu Bei occupied most of Hubei and Hunan, and also captured Sichuan. In 220, Cao Cao died of illness, and his son Cao Pi abandoned Emperor Xian of Han Dynasty, calling himself Emperor, with the title of Wei and its capital in Luoyang. In the second year, Liu Bei proclaimed himself emperor in Chengdu, which was called Shu in history. In 222, Sun Quan also became king, with the title of Wu and the capital of Jianye. At this point, the situation of the three countries was formed.