Winter Solstice, also known as “Winter Festival” and “He Dong”, is one of the twenty-four Chinese solar terms and one of the eight major weather terms, opposite to the summer solstice. It is one of the twenty-four Chinese solar terms and one of the eight heavenly signs. It is the time when the air of the final collection reaches its extreme.” The winter solstice begins when the sun reaches 270° of the ecliptic, which is around December 22 of the Gregorian calendar. On this day, the sun reaches its southernmost point of the year, almost directly on the Tropic of Capricorn (23°26′ S). The northern hemisphere receives the least amount of sunlight on this day, 50% less than the southern hemisphere. The daylight in the northern hemisphere reaches its shortest, and the further north the daylight gets, the shorter it gets. In the traditional Chinese theory of yin and yang five elements, the winter solstice is the key festival of the transformation of yin and yang. In the twelve divisions of the trigrams for the mines to repeat the trigrams, known as the winter solstice a Yang Sheng. Yi said: the first king to the day closed, business travel can not. The winter solstice sun height is the lowest, the shortest sunshine time, the ground absorbs less heat than the heat loss, after the winter solstice will begin to “count nine”, every nine days for a “nine”. Around the “three nines”, the ground accumulates the least amount of heat and the weather is the coldest, so it is said to be “cold in the three nines”, while “nine nines” is already in January and February of the summer calendar, and most areas of China have already The “Nine-Nine” is already in January and February of the summer calendar, and most of China has already entered spring, so the “Nine-Nine sunny days”. Chinese medicine believes that the winter solstice is a good time to maintain health, mainly because “Qi begins at the winter solstice”. The reason is that from the beginning of winter, life activities start to change from vigorous to declining, from dynamic to static. Scientific health care at this time can help to ensure vigorous energy and prevent premature aging, to achieve the purpose of prolonging life. Winter solstice diet should be diverse, grain, fruit, meat, vegetables reasonable mix, appropriate use of high calcium food. Different regions have different customs on the winter solstice. In northern regions, it is customary to slaughter sheep, eat dumplings and wontons on the winter solstice; in southern regions, it is customary to eat winter solstice rice dumplings and winter solstice long-line noodles on this day; and in southern Jiangsu, people eat fried tofu with scallions on the winter solstice. Winter solstice is one of the most important festivals in health science, mainly because “winter solstice is the first sunrise”. The winter solstice is the coldest season from the winter solstice to the cold and cold, and people with heart and hypertension tend to get sicker and suffer more “strokes”, and are also prone to frostbite. Therefore, in the winter season, for hypertension, arteriosclerosis, coronary heart disease patients, we should be especially vigilant to prevent attacks, should take the following preventive measures: 1, pay attention to the cold to keep warm. When the temperature drops below 0 ℃, to add clothes in a timely manner, clothing and pants should be good thermal performance, but also soft and loose, should not wear too tight, in order to facilitate blood flow. 2, reasonable regulation of diet and living, no alcohol, no smoking, no overwork. 3, maintain a good state of mind, emotional stability, happy, avoid anger, impatience and mental depression. 4, to carry out appropriate cold exercise, such as the usual insist on washing the face with cold water, etc., to improve the body’s adaptability to cold and cold tolerance. 5, always observe and pay attention to changes in the condition, regularly go to the hospital for examination, take the necessary drugs to control the development of the disease, to prevent problems before they occur.