This study is the contents regarding the thought quality of Rui-Yi(儒醫) medical science. I shared this subject a lot with three branches and i analyzed. The thought ground of the Rui-Yi(儒醫) is the Ren(仁). Them applied meaning of human medically. This became the basic idea of Chinese medical science. The practice of mind the place did with focus of studying abroad. The Rui-Yi(儒醫) it applied with ground of the medical objection. The Zhi-zhong-he(致中和) from medical science explains with the Yin-Yang(陰陽), the principal is a possibility of searching from the iching-study(易學).