The “Lidong” festival is held on November 7 or 8 every year. In ancient times, it was customary for folk in China to take Lidong as the beginning of winter. What is the meaning of the two words “立冬”? Lidong, in ancient Chinese, means to establish, to start; winter, means the end, and refers to the collection of all things. It means that winter is coming, grains are stored in storage after being harvested in autumn, and animals are hiding and preparing for hibernation. At the time of winter, the climate is characterized by three main points: 1, the temperature drops, the change is obvious: the sun has reached the southern hemisphere, the northern hemisphere gets less and less solar radiation, because at this time the surface of the summer half of the stored heat there is still a certain amount of surplus, so generally not too cold, often warm and comfortable “small sunny spring” weather, but, at this time, the northern 2, easy to have frost and fog: normal year in November, Jiangnan area into the late winter, there will be frost, after the cold air, although the temperature rose, but the air quality is easy to become worse, easy to form smoke and fog. 3, the air tends to dry: after the winter, more northerly winds The wind strengthens, precipitation is significantly reduced, and the air and soil are prone to lack of moisture. So in reality, what should we pay attention to on the day of winter and how to take care of it? Chinese medicine believes that “the unity of heaven and man”, that is, the human body and the natural world is a whole, should also be in line with the laws of nature. For example, a tree has the law of “spring, summer, autumn, winter”. When winter comes, the yang energy is hidden, the yin energy is strong, the leaves wither, but the roots of the tree are hidden, constantly storing and collecting nutrients, nourishing the essence and preparing for the coming spring. China’s earliest medical classics “Yellow Emperor’s Classic of Internal Medicine” pointed out that “in March of winter, this is said to be closed, water ice ground chap, no disturbance to the Yang, sleep early and get up late, must wait for daylight, so that the will if the ambush if hidden, if there is a private intention, if to have, to go cold on the warmth, no leakage of skin, so that the gas is taken away, this winter gas should be, the way to nurture Tibet.” Therefore, winter health is mainly to comply with the “closed” law. First of all, pay attention to the appropriate tonic. There is a folk saying that the winter tonic winter, but not blindly tonic. In winter, the weather in the northwest is cold, so it is appropriate to supplement the warm and hot products, such as cattle, mutton, dog meat, etc.; while the south of the Yangtze River, although winter has begun, but the temperature is milder than in the northwest, so the tonic should be clear and sweet warm taste, such as chicken, duck, fish; if the rainfall is less and the climate is dry, it is appropriate to sweet and moist products of vegetables and fruits, fungus, rock sugar. In addition, it should also vary from person to person, because there are differences between men and women, old and young, the body has a deficiency of cold and heat, adolescents focus on nourishment, middle-aged focus on conditioning, the elderly focus on protection. The actual situation should also be targeted according to the choice of tonic way, in addition to replenish Qi and blood, nourishing Yin and warming Yang and other conventional methods, some people should be clear as a tonic, some people to pass as a tonic, some people to remove phlegm and dampness as a tonic, etc., must not blindly “tonic”. Second, pay attention to the cold to keep warm. After the winter, although there is a “small spring” of warm weather, but do not be greedy for cold, should not be implemented in the fall to “freeze a” lecture. The emphasis on early to bed and late to rise, to ensure sufficient sleep, is conducive to Yang Qi hidden, Yin essence accumulation. The winter season, the temperature changes, hypertension, coronary heart disease patients should pay more attention to warmth, regular medication, reduce sweating physical activity, as “winter when the sky and earth are closed, the blood is hidden, people should not make labor sweat, the release of Yang Qi”. Patients with cervical spondylosis and lumbar spondylosis should pay attention to local warmth and do some gentle exercises, such as taijiquan and baduanjin, and other health exercises. Chinese medicine believes that “cold is Yin, often hurt Yang”, the human Yang is like the sun in the sky, warming the whole body, promote the blood vessels run, winter does not pay attention to cold Yang, will make the body lose the vitality of metabolism. Finally, attention should be paid to quiet. To maintain a calm state of mind, “…… make the will if the ambush if hidden, if there is a private intention, if to have the gain”, is to strive for its quiet, control the activities of the emotions, keep the mental and emotional tranquility, containing but not revealing, to avoid annoyance, so that the body of Yang Qi can be hidden. After the winter, the outdoor climate is dry, foggy and the air quality is poor, so outdoor activities should be reduced and it is advisable to recuperate.