The distinctive preventive medicine theory of TCM, which is to treat the disease before it happens, emphasizes the importance of regulating health and nourishing the nature, and preventing disease before it happens, which means that “if the righteousness is present, the evil cannot dry up”. It requires people to regulate their mental will and avoid excessive emotional and moral changes; to pay attention to the four seasons of yin and yang to maintain the body’s yang energy; to have a reasonable dietary structure and to live a regular life. Early detection, early diagnosis and early treatment of diseases are the key, for example, for stroke, if there is numbness and sluggishness in the limbs, it is a blockage of the veins and ligaments, so Danshen, Hong Hua, Chuanxiong, Red Peony and Chicken Blood Vine are given to invigorate the blood and open the ligaments; if dizziness is seen, Hooked Vine, Tian Ma, Shijiao and Chrysanthemum are given to calm the liver and quench the wind, so as to prevent the occurrence of stroke. Once the disease occurs, fight for the initiative of treatment and prevent its transmission. This is what is meant by the saying, “First, we should secure the place where the evil has not been received” and “When we see the disease of the liver, we know that the liver transmits the spleen, so we should first strengthen the spleen”. For example, in diabetes, if the blood sugar is not well controlled, it will cause damage and lesions to the heart, brain, kidney, eyes and other organs in the long run. Therefore, for diabetes, while paying attention to early blood sugar control and islet function repair, Chinese herbal medicine should be used to focus on nourishing Yin, invigorating blood and opening blood channels. For diseases with obvious seasonality, it is often possible to treat them beforehand and prevention is the main focus, which can often get twice the result with half the effort. For example, asthma often occurs in autumn and winter, so “winter disease summer treatment” in summer and active prevention can effectively control attacks or reduce the number of recurrence. In general, most patients are weak after first healing, so it is required to do away with evil in the rehabilitation medical treatment. In view of the patient’s pathological characteristics, such as the decline of qi and blood, fluid deficiency, spleen and kidney deficiency, blood stasis and phlegm obstruction, comprehensive measures are taken to promote the normalization of the function of the internal organs as soon as possible, so as to achieve the purpose of eliminating the evil and healing the disease and not recurring. For example, during the remission period of coronary heart disease, the formation period of cerebrovascular disease, and the prevention of complications after the formation of diabetes, targeted drug treatment or adjustment can be taken to control its reoccurrence. The “cure for the untreated disease” in Chinese medicine is to take preventive or therapeutic measures to prevent the occurrence and development of diseases, which is the basic principle of the doctrine of Chinese medicine. The treatment of the untreated disease contains three meanings: first is to prevent disease before it happens, emphasizing the regimen to prevent the occurrence of disease; second is to prevent its transmission after the disease, emphasizing early diagnosis and early treatment, timely control of the development and evolution of the disease; third is to prevent the recurrence of disease and cure the sequelae after healing. 1, prevention before illness: strong body to prevent disease, pay attention to the regimen to strengthen the body. Regimen is to regulate the spirit of the will for the purpose, the mind to maintain peace and quiet, no distractions. The essence and the spirit to hold in the internal, avoid excessive emotional changes, open-minded, optimistic and happy, so that you can achieve the purpose of replenishing the true energy. For the external abnormal climate and harmful disease-causing factors, we should avoid them in time, obey the changes of the four seasons, and maintain the harmony with the external environment. People are required to eat and drink in moderation, live in a regular manner, work but do not make their bodies overly tired, and also abstain from desire to protect the essence. Oppose “to wine as a pulp, to delusion as a regular, drunk to enter the room, to desire to exhaust its essence, to dissipate its true”. Otherwise, it will lead to disease and premature aging. In addition, on the basis of long-term practice, the creation of many effective methods of strengthening the body, such as five-animal play, qigong, taijiquan, eight-danjin, Yijinjing, etc.. 2, both disease and prevention of change: After the occurrence of disease, we must understand the causes and mechanisms of disease, grasp the disease from the surface to the inside, from shallow to deep, from simple to complex development of the law of change, to fight for the initiative of treatment, in order to prevent its transmission. For example, the treatment of liver disease is combined with the method of strengthening the spleen and stomach, because liver disease is easily transmitted to the spleen and stomach, and the method of strengthening the spleen and stomach is to treat the disease before it occurs. 3.Preventing recurrence of disease and curing sequelae after healing: In order to achieve the purpose of “recovering after illness”, the treatment should be well started and well finished. The main purpose of the post-cure regimen is to prevent the recurrence of the disease.