Radiotherapy is a double-edged sword, which can kill tumor cells but at the same time will also kill normal tissues and cells. Paying attention to dietary adjustments during radiotherapy has a certain effect on the role and side effects of radiotherapy. In different periods and conditions, the following points should be noted when choosing food with anti-cancer effect. At the early stage of radiotherapy, it is advisable to choose the products that nourish yin and promote the production of fluids, clear heat and cool the blood, such as turtle, cuttlefish, scallop, loach, oyster, duck, spinach, cabbage, celery, amaranth, purslane, bean sprouts, bamboo shoots, bitter gourd, eggplants, cucumber, winter melon, watermelon, pears, mandarin orange, persimmons, mung bean, red bean, loofah, fungus, lily, lotus seed, jujubes, cauliflower, potatoes, Chinese yam, apricot kernels, grapes, peaches, figs, raw honey and so on. Honey, etc. For those who suffer from heat and yin injury, it is better to eat more cool and nourish yin, sweet and cold products to promote the production of fluids, such as avocado, water chestnuts, fresh lotus root, watermelon, green beans, sugar cane, lilies, winter melon, etc. For those who suffer from both dampness and heat, they should eat foods that clear away heat and promote dampness, strengthen the spleen and regulate qi, such as asparagus, mushrooms, bananas, mandarin oranges, hawthorn, loofah, lotus root, lentils and so on. Radiotherapy-induced bone marrow suppression can be added to the appropriate amount of ginseng, huangtiao, ginseng, ganoderma lucidum, chasteberry, wolfberry, jujube, etc., which can play a role in increasing red and white blood cells. Avoid eating hot, spicy, fragrant and dry foods, such as mutton, venison, dog meat, beef, rabbit meat, chili, yellowtail, scallop, crab, lychee, longan and so on. Diet should not be monotonous, too fine, should eat more fiber-rich food. Keep the bowels smooth, improve appetite, do not eat nourishing and greasy food to hinder the stomach, so that radiotherapy can be completed successfully.