The Confucianists thought that the emperor was the highest ruler of traditional empire, he must care about the people, even considering his words and deeds to the domestic influence. Since the emperor was supreme policymaker of government, his faith influenced the religionary policies of the country. This paper try to understand emperors' religiosity in Song dynasty. In order to find out emperors' faith, I analyze laws, policies of religion, some religionary activities. Secondly, I study the emperors' views on unknown world by some mediumistic events that happened at imperial palaces in Song dynasty.