The mid-term Korean scholar Quan Kezhong’s ""Notes on Zhouyi Cantong qi “ is the earliest commentary on the "" Zhouyi Cantong qi"" in the Korean History of Thought. Influenced by the theory of dual practice for mind and body in the late Tang and early Song Dynasties, Quan has established a theoretical system that united the theories of Xingli, Dan and Yi. Quan’s study of life in his early years was influenced by the Yul-Gok School; he abandoned his government position in middle age and sought for the Tao; annotated on“Can” to reveal the purpose of Dan theory in his old age. “ Notes on Zhouyi Cantong qi” explains the scriptures with the method of the combination of Immortal and Zen, and promote the importance of dual practice for mind and body, beyond these, Quan also added new explanations by integrating theories of ""Confucianism"" and “Can” among them. Therefore, this article is based on the ""Notes on Zhouyi Cantong qi” as the main research, use the ""regularity of qi”, “dual practice for mind and body”, and ""the combination of Immortal and Zen"" as the main axis of the discussion. With the hope to reveal Quan's personal characteristics that he has put in the Neidan thought, and can be used to construct the overall appearance of Quan's theory in the future, further to benefit the Korean academia to understand the development of Dan “Yi” theory.
