The theory “Nourishing yang in spring and summer, nourishing yin in autumn and winter”, first put forward by Siqi Tiaoshen Dalun of Suwen, is a method to guide how adopt appropriate method to cultivate health along with the change of four seasons. In consideration of the phenomenon which exists popularly in our modern society that many people are in sensible of the theory, even misunderstand it. Combined with preliminary understanding towards Chinese medical classic ancient books and personal experience, the author elaborates the mechanism of ‘Nourishing yang in spring and summer, nourishing yin in autumn and winter’ and its application in Chinese Medical health cultivation.