To understand characteristic of preservation of health in Sasang constitutional medicine, 1 first study preservation of health In ${ulcorner}$Dongyi Bogam${lrcorner}$, and then study preservation of health in the ${ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${lrcorner}$ particularly Inherent vitality(命脈實數) and Regimen in ordinary life(生息充補之道) which shows early thought of Lee Je-ma. I acquire relation and difference between ${ulcorner}$Dongyi Bogam${lrcorner}$ and Dongyi Soose Bowon Sasang Chobongyun${lrcorner}$, and conclude as follows. 1. In preservation of health ${ulcorner}$Dongyi Bogam${lrcorner}$ says Ups and downs of Qi according to degree, tells congenital health and acquired care of health, grades Jin-In, Ji-In, Seong-In, Hyeon-In according to degree of moral culture, and especially emphasizes managing mind which is based on Taoism. 2. In ${ulcorner}$Dongyi Soose Bowon Sasang Chobongyun${lrcorner}$ Dongmu divides human being to Sasangin(Taeyangin, Taeumin, Soyangin, Soeumin) according to Large & small of viscera, and regards as determine lift span and rendition of disease & health according to Inherent vitality which is degree of Small viscera. 3. Inherent vitality of Sasangin is supplemented by Regimen in ordinary life. Because Regimen in ordinary life decreases according to age, Dongmu emphasizes managing mind through an autonomic Knowledge Deed to maintain Regimen in ordinary life. 4. In the way of managing mind ${ulcorner}$Dongyi Bogam${lrcorner}$ says Taoist moral culture, but Dongmu emphasized control of knowledge and Deed by Confucian moral culture and the mind of control others through confucian self-control.