Lung cancer is one of the malignant tumors with high incidence and the greatest threat to human health and life. Patients with advanced lung cancer can have a longer survival time and a higher quality of life if they are treated and cared for properly, so patients with advanced lung cancer should pay attention to dietary regimen. The general principles of diet for advanced lung cancer should be high energy, high protein, enhancing patients’ immunity and resistance, as well as other symptomatic diets, and spicy and stimulating foods are strictly prohibited. First of all, ensure sufficient supply of energy and protein, such as rice and noodles, eggs, milk, lean meat, fish and shrimp, soy products, etc., and eat more fresh vegetables and fruits. In the case that the general diet can be balanced intake, energy and protein to meet the patient’s own needs, you can selectively supplement, according to their own conditions, a small amount of ginseng, party ginseng, cordyceps, royal jelly and other ingredients. But never remember not to put the cart before the horse, do not overly pursue a particular food, its immune enhancing effect, a balanced diet can only improve the overall immunity of patients. Secondly, we should add some natural foods that enhance immunity, such as yam, tomato, yellow fish, shrimp, shiitake mushroom, flat mushroom, wood ear, silver fungus, oyster, etc. At the same time, patients with advanced lung cancer may suffer from loss of appetite due to pain, increased consumption caused by tumor growth and toxins, and increased levels of tumor cytokines in the body, all of which may cause serious wasting, anemia, or even cachexia, and for these patients, simple dietary intake cannot meet their nutritional needs, so they need to add oral nutritional supplements under the guidance of nutrition physicians. In such cases, oral nutritional supplements should be added under the guidance of a nutrition physician. Thirdly, for patients with loss of appetite, nausea, or even vomiting, the diet should be light, avoiding greasy, fried and cold food.