Dang Jonghae put in order symptoms to volume one of Uihakgyeonneung by the attack region of illness, to volume two of Uihakgyeonneung by systemic symptoms, and ones peculiar to gynecology and pediatrics to volume three of Uihakgyeonneung. He presented the basis of a differential diagnosis by Yin-Yang, heat and cold, weakness and firmness. He seized the cause and mechanism of a disease obviously and took measures to cope with a disease. These were the result of his rationality that he integrated the Chinese and Western medicine. That is to say, he summarized the voluminous medical books and extracted the essential ones to utilize conveniently, and he made us grasp the essence of medicine to make symptoms concrete. Therefore, we can study this book as the fundamental courses to make use of basic research and clinical medicine.