Abstract: Until before the mid Tang Dynasty, Buddhism and Taoism once initiated reconciling theory respectively, and successive monarchs also moved to reconcile, but the real harmony among Confucianism, Buddhism and Taoism was not realized. Buddhism accomplished its sinicization before and after the mid Tang Dynasty, and Taoism showed all the characteristics of the native religion. Confucianism felt the crisis consciously; hence with Han Yu Zhao beginning, and the Neo Confucianism in Song Dynasty finally completed its function, reasonably blended the Buddhism, reconstructed Songs ideological system and eventually regained sovereignty discourse of the relationship among the three religions. In this process, Buddhism and Taoism put Confucianism values consciously into their doctrines; took initiative to be close to Confucianism. And the kings of Song Dynasty as the supreme rulers, although they had individual worship of Taoism and Buddhism, they always took the reconciliation of the three religions as the basic national policy; there are still valuable historical details to explore and draw the policy trends of the rulers from reconciling three religions externally to the integration of three religions. These changes and interactions constituted a major theme of the transformation of the Tang and Song Dynasty in the field of thoughts.

Key words: the transformation of the Tang and Song Dynasty, the harmony of three religions, the integration of three religions, cultural pattern, Confucianism domination