Looking for the identity of Korean Calligraphy is quite important but not easy work also hard to define what it is in a sentence. However, it is needed to find out what is identity of it. The reason why it is hard to find out is that Korean have basic identity but the identity of Calligraphy has been different by centuries. It can be largely divided into three reasons. Firstly, the period from three Kingdoms to the beginning of Goryeo, Secondly, the period between the end of Goryeo and the middle of Joseon, this is the time when the doctrines of Chu-tzu was dominated to the society. Thirdly, the end of Josen is the period when scholars of the Realist School of Confucianism were appeared. In this periods, Buddhism was flourished but Buddhist insisted the intercommunication of three religions named Confucianism, Buddhism and Immortal Taoism. The ancient tasteful ideas was called Geupbaek(皀帛) scholar in Koguryo, Hwarang(花郞) scholar in Shilla and Taoist in Goryeo that could be unique. This intercommunication of three religions was expressed as scholar or Taoist by the people named Choi Chiwon, Lim Chun, Lee Gyubo and etc. They could have different the period of their lifetime or ages, but have the similarity of the selection of words through their articles. Thus, it could be known that the identity of calligrapy was considered by the articles about calligraphy or poems of these three people mentioned formerly. From this research, the identity of calligraphy from late Shilla to early Goryeo was influenced by the intercommunication of three religions based on tasteful ideas followed by Hwarang sprit and the scholar thought. And, it is summarized that the identity of calligraphy is Taoist ideology because this scholar thought could be concluded to Taoist ideology through the directivity of great writing and conduct.