Traditional Chinese medicine's method of preserving health and protecting yang Chinese medicine believes that damage to yang will lead to diseases. Therefore, people can avoid diseases by maintaining yang. Here are some ways to protect Yang Qi, such as diet, common non-drug therapy and ointment, to achieve the purpose of health care and disease prevention. From the perspective of Chinese medicine, food has different tastes, mainly including "four qi" of heat, temperature, cold and cool. Food intake is the same as medication. If it is suitable for the human body, it will eliminate diseases and strengthen the body. If it is not suitable for the human body, it will increase diseases and damage the body. Cold food can damage yang, while warm food can protect yang. Cold foods have the functions of clearing away heat, purging fire and detoxifying, such as Coicis Semen, mung bean, wax gourd, bitter gourd, cucumber, towel gourd, mustard, purslane, eggplant, lotus root, tofu, laver, kelp, snail, crab, pear, banana and watermelon. Warm foods have the function of warming yang and dispelling cold, such as sorghum, black beans, glutinous rice, pumpkin, leek, pepper, garlic, beef, mutton, chicken, pigeon meat, shrimp, sea cucumber, litchi, longan, jujube, chestnut, walnut meat, ginger, fennel and pepper. Flat food, which is between cold and warm, has the function of invigorating spleen and stimulating appetite, such as rice, millet, corn, soybean, pea, sesame, cabbage, carrot, potato, yam, fungus, pork, rabbit, duck, quail, bird's nest, perch, loach, fig, coconut, peanut, apple and so on. People with yang deficiency often use dietary remedies. Those with exogenous wind-cold manifested as fear of cold and wind, runny nose and backache can take 30 grams of ginger, 3 slices of scallion and 30 grams of brown sugar with water to help yang dispel cold. Eating cold, abdominal pain, diarrhea likes warm pressure, and the mouth is light but not thirsty. In loose stool, ginger 15g, pepper 30g and pork tripe 200g can be used as stew soup to relieve pain by warming the middle. For women with less menstrual flow and cold limbs, 20 grams of Angelica sinensis, 30 grams of ginger and 200 grams of mutton can be used to stew soup, or fresh Artemisia argyi leaves 15 grams and ginger 10 grams of scrambled eggs can be used to regulate menstruation and dispel cold. Frequent urination at night, sore waist and knees, weakness of limbs, can use 30 grams of Morinda officinalis, 30 grams of Eucommia ulmoides, half a black-bone chicken, boiled soup to strengthen kidney and shrink urine.