The establishment and initial development of a unified multi-ethnic country is the characteristic of Qin and Han Dynasties, which is collectively called the period of great unification of Qin and Han Dynasties in the history of China. Qin and Han Dynasties were the first period of great unification in China's history, and also the period of laying the foundation for a unified multi-ethnic country.

1 the stage characteristics of Qin and Han dynasties

1. Politically, this stage is the establishment and consolidation of centralization in China feudal society.

2. Ethnic relations: The Qin and Han Dynasties were the initial prosperous period of ethnic relations in China feudal society.

3. Foreign relations: At this stage, China's exchanges with North Korea, Japan, West Asia and Europe began to develop in the form of trade, diplomatic envoys and scientific and cultural exchanges.