During the Three Kingdoms period, it was rare for northern nomads to go south to the Central Plains.

At the end of the Eastern Han Dynasty, a peasant uprising broke out. Due to the attack of the Yellow turban insurrectionary, the Eastern Han Dynasty was torn apart, resulting in a local separatist regime. With the political chaos of Dong Zhuo, when Emperor Xian of Han moved to Luoyang in the first year of Jian 'an (196), a separatist situation was formed. In this year, Cao Cao moved his capital to the Han dynasty, was allowed to enter (now Xuchang, Henan) county, and won? Are you convinced or not? Political status. Cao Cao set a field near Xudu and began to drill soldiers. Gradually, Cao Cao's influence dominated the south of the Yellow River. In the fifth year of Jian 'an (200 years), he controlled Cao Cao and the Yellow River and fought Yuan Shao in Guandu, which laid the foundation for unifying the north. In Jian 'an13 (2008), Cao Cao led more than 200,000 people, and 800,000 troops marched eastward to fight with Sun Wu's allied forces in Chibi.

Battle of Red Cliffs laid the foundation for the tripartite confrontation among the three countries. After that, Liu Bei occupied Hanzhong and Sun Quan occupied Wu. In 220, Cao Cao died, and his son Cao Pi seized the Han Dynasty and proclaimed himself emperor in Luoyang, with the title of Wei. The following year, Liu Bei proclaimed himself emperor in Chengdu, with the title of Han. In the same year, Sun Quan became king in Jianye, with the title of Wu. The tripartite confrontation was formally formed. In 256 AD, Sima Yan established the Western Jin Dynasty, and the situation of the three kingdoms standing in the balance lasted for about 50 years. During this period, the northern minorities also entered the Central Plains, but most of them were placed in the Central Plains, which was not aggression. However, after that, the tyranny of the Western Jin Dynasty and the rebellion of the Eight Kings appeared, which became an opportunity for ethnic minorities to establish political power in the Central Plains. Generally speaking, the Jin, Southern and Northern Dynasties in the Three Kingdoms period was an important period of great ethnic integration in China.

During the Wei, Jin, Southern and Northern Dynasties, the ethnic minorities active in the north and northeast mainly included Huns, goats, Xianbei, Chile and Rou. Starting from Hanzhong Leaf, it moved to the south of Xiongnu living in the Mongolian Plateau. According to the Han court, it was placed in the vast areas of Shaanxi, Gansu and Inner Mongolia. At this time, the main fighting capacity of Xiongnu was completely defeated, and some of them advanced westward, but they chose to surrender. During the Eastern Han Dynasty, more and more Huns moved to the south. At the end of the Eastern Han Dynasty, the Southern Xiongnu led the kitchen to Cao Cao in the spring. Cao Cao scattered Xiongnu in six counties: Xihe, Taiyuan, Yanmen, Xinxing, Shang Jun and Hedong. At this time, Xianbei began to develop in the northeast after getting rid of the rule of Xiongnu. There are three main tribes in Xianbei: central, eastern and western. After the disintegration of the alliance, Murong, Yuwen and Duan developed and were also involved in the turmoil in the late Western Jin Dynasty. Chile is active in Danbei and is also active in the western region. In order to protect the Northern Wei Dynasty, it failed to expand its power to the Central Plains.

At that time, the ethnic minorities in the northwest mainly included Zhang, Tuguhun and the ethnic minorities in the western regions. During the Eastern Han Dynasty, many Qiang people moved to Gansu and Shaanxi. At the end of the Eastern Han Dynasty, Qiang people took part in the peasant uprising. After being suppressed by Dong Zhuo, he participated in the separatist melee. During the Three Kingdoms period, the Qiang people in Guanzhong were mainly distributed in Beidi, Xinping and Anding counties. There are also Qiang people in Hanzhong. Because I have lived with the Han people for a long time, I am not much different from the Han people. During the period of Emperor Wu of the Han Dynasty, a group of people were placed in Jiuquan County. During the Three Kingdoms period, the Yu people moved to Guanzhong counties. Tu Guhun lives in Qinghai Province. Maintain close relations with the Central Plains regime. The ethnic relations between the Western Regions and the Central Plains continued intermittently, and there was no major war on the whole.