Buddhism had been developed in Sui and Tang period.As a result of the development of social history and culture,Buddhism influenced greatly on politics,society,literature art and philosophy and so on ,Which is the social basis of the influence of Buddhism on ancient Confucianism.Use the "mind nature theory"of native Confucianism for reference,Buddhism had completed the process of Chinalization and enriched the subject-sense Confucianism,in which the belief the theory of Zen influenced the most.