TCM diet therapy has a long history and is characterized by the integration of food and medicine, i.e. health care and disease prevention. The diet of elderly cancer patients should pay attention to the following points: 1. For example, for deficiency evidence, it is appropriate to use tonic products, for actual evidence, it is appropriate to use products that dispel evil, for cold evidence, it is appropriate to use products that warm and disperse, and for heat evidence, it is appropriate to use products that clear the drainage. Yang deficiency should eat hot food, such as litchi, beef, dog meat, etc.; Yin deficiency should eat nourishing and clearing products, such as lily, silver fungus, etc.; regardless of cold and heat deficiency, all brutal supplementation, it is difficult to help patients recover. For example, snapper is a cool nourishing product, which is not suitable for those with cold stomach; eel is a warm tonic, which is suitable for those with cold stomach. Food includes yam, coix seeds, mountain hold, milk, red dates, millet, chicken, duck, fish, etc. 2, diet should be adapted to the four seasons of the climate. The four seasons of climate alternation, humans must comply with the laws of nature and not contrary. In the spring and summer, the Yang energy is strong and everything is full of vitality, so you should try to eat less dog meat, mutton and other warm products; in autumn, when everything is dry and depressed, patients often have dry mouth and epistaxis, so they should try to eat less hot and spicy food and eat more watery fruits; in winter, when it is cold, you should eat less cold food to prevent injury to the stomach, and it is advisable to eat warm and tonic products, such as oranges, beef and mutton. 3.Adjust diet according to different treatments. Elderly cancer patients undergoing radiation treatment are prone to internal heat and yin deficiency, such as dry mouth and sore throat, mucous membrane ulcers, etc. They should supplement products that nourish yin and produce fluid, such as fresh vegetables and fruits, and avoid spicy and stimulating foods. After surgery, elderly cancer patients have suffered a major injury to their vital energy and their digestive and absorption functions have decreased. For elderly cancer patients who suffer from deficiency of qi and blood after chemotherapy, it is advisable to take medicinal foods that benefit qi and replenish blood, such as American ginseng, astragalus, wolfberry, etc., to restore physical strength and ensure the smooth progress of chemotherapy. Foods related to cancer prevention, such as Ganoderma lucidum, shiitake mushroom, black fungus, Chinese wolfberry and Coix seed, contain polysaccharide substances, which can improve the immunity of the body and inhibit the growth of tumor. Vegetables such as carrots, cabbage, lettuce, jujube, syncope and bac choy contain essential nutrients, vitamins and trace elements, which are necessary in the process of enzyme metabolism and can improve the phagocytosis of reticulum system and leukocytes and enhance the body’s ability to resist diseases. The volatile oil contained in garlic, onion and asparagus has the effect of inhibiting and blocking the transformation of nitrate into the carcinogenic substance amine nitrite. It is beneficial to the recovery of elderly cancer patients to eat more of the above-mentioned foods in normal times.