1. The open policy in the Tang Dynasty promoted great ethnic integration.
2. The Tang Dynasty adopted an enlightened national policy, respected the habits of ethnic minorities and protected their interests.
3. During the Tang Dynasty, the communication and integration between Han nationality and ethnic minorities were further strengthened.
4. The integration and innovation of multi-culture in Tang Dynasty promoted the spread and influence of Chinese civilization.
The Tang Dynasty actively exported its own cultural and academic achievements, which promoted cultural exchanges and academic development between China and foreign countries.
The above are the main characteristics of the development of multi-ethnic countries in the Tang Dynasty. Generally speaking, the Tang Dynasty adopted an open and enlightened national policy, which promoted the blending of nationalities and multiculturalism and promoted the spread and influence of Chinese civilization.