Therefore, the Cenling period, in which China's feudal history books may be presented in the Tang Dynasty, was quite numerous, but the accurate and feasible ethnic policies of the handlers played a positive role. During the Tang Dynasty, the Chinese nation was in a period of multi-ethnic communication, and many ethnic minorities were extremely envious of China's elegance and superb skills, which made them want to move to the Central Plains and communicate with the Han nationality. Because of the earlier minority policy in Tang dynasty, it is not suitable to accept active entertainment policy when the national strength is weak. Since then, the national strength has been strong, and Tang actively mobilized his national strategy, which can be said to be changeable. Good results have been achieved. Harmonious ethnic relations also enabled Tang to absorb many good civilizations and production technologies from ethnic minorities, which stabilized and inspired the peaceful situation at that time.