Ethnic integration is one of the remarkable characteristics of the history of Wei, Jin, Southern and Northern Dynasties. Ethnic integration refers to the natural integration between ethnic groups, eliminating ethnic differences and ethnic barriers, and is the result of close ties between ethnic groups in economy, culture and living habits. From the perspective of social development, the process of ethnic integration is the process of feudalization of ethnic minorities and the progress of history. The forms and ways of ethnic integration in this period are as follows: ① Ethnic migration: Since the Wei and Jin Dynasties, Huns, Xianbei, Jie, Di and Qiang have moved in a large number and lived together with the Han people in northern China. (2) Unity struggle: The cruel exploitation and oppression of the people of all ethnic groups by the rulers at the end of the Western Jin Dynasty, the years of war in the Sixteen Countries, the destruction of the northern economy, and the hardships of people's lives forced the people of all ethnic groups to unite and fight together, thus making the ties between all ethnic groups closer. Friendly exchanges: Since Wei and Jin Dynasties, there have been several unified situations in northern China. In a peaceful environment, frequent exchanges between people of all ethnic groups have further accelerated the process of national integration; During the war, this kind of communication never stopped. (4) Under the historical conditions at that time, the struggle between various ethnic groups broke the original tribal organizations of various ethnic groups, which was conducive to national integration. ⑤ Reform of minority rulers: The reform of Emperor Xiaowen in the Northern Wei Dynasty carried out the policy of sinicization, which promoted the great ethnic integration.