The activities of the northern ethnic groups in Chinese history have played an extremely important role in the formation, development and consolidation of the Chinese nation. In their journey went south to the Han Chinese mainland and merge with the Han group, the northern ethnic groups established political power, unified China, contacted and accepted Buddhism without exception. Buddhism has become the carrier of the traditional Chinese culture in the development of China. Accepting Buddhism has raised the level of civilization for the northern ethnic groups, and has played a major and irreplaceable positive role in promoting the exchange and integration between Northern ethnic groups and the Han group in mainland.