In order to study for the principle of the Dan-Jeon respiration and Seon meditation to be ascetic exercises for the sake of experience of Oriental medicine as practical science, they were investigated the theory of the Jeong-Gi-Shin. The results obtained were as fallows ; 1. The Dan-Jeon respiration was Mahayana of ascetic exercises to act demension of Gi to be observed two sides of material and spirit. 2. The Seon meditation was Mahayanea of exercises to experience demension of Shin to be the subject of life directly. 3. Even though Dan-Jeon respiration takes the golden mean of Shin, it belongs to the category of Jeon-Gi to correspond to appearance of material dimension. Seon meditation utilizes the Jeong-Gi in the stage of the golden mean of Shin. As results, Dan-Jeon respiration does not get out of the world of appearance centering around the Gi. But Seon meditation gets out of the world of appearance and utilizers the relativity in the free absoluteness.