1. Objectives This study is for comparing between theory about "Constitution" in China and Sasang constitutional Medicine in Korea 2. Method I refered to the literatures about "Constitution" published in China and Korea 3. Result and Conclusion 1) "Constitution" in Traditional Chinese Medcine(TCM) is reinterpretation of Traditional Chinese Medcine, while, Constitution in Sasang Constitutional Medicine is an innovative concept developed from Traditional Korean Medicine. 2) The concept of "Constitution" in Chinese Medicien is related to long-term-period symptom or physical condition, while, the concept of Constitution in Sasang Constitutional Medicien includes not only long-term-period symptoms or physical conditions but also natural superiority and inferiority of individual according to 4 type Constitution. 3) The concept of Constitution in Sasang Constitutional Medicien has organized mind-body system than Concept of "Constitution" in Chinese Medicine. According to the theory of Sasang Constitutional Medicine, Mind is one of the best important things related type of disease. Lectures of Sasang Constitutional Medicine give a full detail of correlation of Mind and disease. 4) Finally, The concept of "Constitution" in Chinese Medicien is changeable but the Concept of "Constitution" in Sasang Constitutional Medicien is not changeable. changeable elements in Sasang Constitutional Medicien are symptoms and syndromes of disease.