Four-season health preservation in Huangdi Neijing refers to nursed back to health according to the laws and characteristics of climate yin and yang changes throughout the year, so as to achieve the purpose of health preservation and longevity. The changes of cold, hot and cool in spring, summer, autumn and winter are formed by the ups and downs of yin and yang in a year. The solstice in winter brings the sun. From spring to summer, the sun grows and the yin disappears, so there is the temperature in spring and the heat in summer. It is cloudy from summer to day. From autumn to winter, the shade grows and the yang disappears, so it is cool in autumn and cold in winter. As a part of nature, human beings can't live without objective natural conditions, but should adapt to the changes of the four seasons to adjust the human body, so as to achieve the health care purposes of balance of yin and yang, coordination of viscera, qi and blood filling, access to meridians, and good mood.