1. Spring and Autumn Period and Warring States Period

It is the initial development period of national integration after China entered the class society. Frequent wars of annexation between vassal States have greatly strengthened the ties between the Central Plains and the surrounding ethnic groups and promoted ethnic integration. In short, during this period, the Central Plains and its surrounding ethnic groups continued to condense, merge and expand, and merged into a new ethnic group-Huaxia. Huaxia people frequently collide and communicate with neighboring ethnic groups through migration, aggregation, national wars and other ways, and constantly absorb fresh blood;

2. Wei, Jin, Southern and Northern Dynasties

During this period, after they stepped onto the political stage of the Central Plains, they suddenly accelerated the process of national integration, dispersing and aggregating. The turmoil has brought profound disasters to China, but objectively promoted ethnic exchanges and the sinicization of nomadic people;

3. Song Liao Jin Yuan

The characteristics of ethnic integration in this period were carried out in border areas. Not only the ethnic minorities and the Han nationality are integrated, but also a large number of Han nationality and ethnic minorities are integrated.