In a year, the 24 solar terms form a natural phenomenon, accompanied by countless weather. Man and nature are a unified whole, and the changes of the 24 solar terms in a year affect the physiological changes of the human body at any time, and the diet that provides the needed nutrition for the human body is closely related to the five internal organs of the human body. Therefore, people's diet and health preservation must also conform to the season and the objective law of the changes of the four seasons and twenty-four solar terms, so as to achieve the goal of health and longevity. This book consists of four parts: nourishing yang in spring, nourishing yin in summer, nourishing yin in autumn and nourishing yang in winter. This paper mainly introduces the methods of keeping in good health in seasonal changes and solar terms alternation, and collects the most effective and valuable recipes for keeping in good health, which provides useful guidance for readers to arrange their daily diet and daily life in different seasons, and helps readers to easily master the secrets of delaying aging, staying young forever, getting rid of diseases and prolonging life.