The oriental medicine is not static knowledge. Since the publication of 『Hwangjenaegyeong(黃帝內經)』, it has unceasingly changed and developed, that changes and developments ate the reflex of culture and civil progression, and they also are active acceptance of the time`s demand. when we look back into the history of the Oriental medicine, angle of understanding disease can be classified into two concepts; internal-external and Eumyang. Internal-external is whether we find the source of disease internal or external. Eumyang is deciding which is more important between yin-essence and yang-gi which are components of the essence-gi of body. This thesis view course of development of theory of the oriental medicine since publication of 『Hwangjenaegyeong(黃帝內經)』 at certain point of internal-external and Eumyang and with those as background, will inquire into sameness and difference between the Korean medicine and the Chinese medicine, and provide an advanced course for the oriental medicine.