Nutrition plays a very important role in the comprehensive treatment of lung cancer, and good nutritional support can help the smooth treatment and recovery. If adequate nutrition is provided before or during clinical treatment, chemotherapy, radiotherapy and surgery will be better tolerated, and the results will be better and recovery will be faster. Usually, the nutrition source of human body can be divided into three aspects: dietary nutrition, enteral nutrition and parenteral nutrition (intravenous nutrition). Dietary nutrition should be the main source, and when dietary nutrition is insufficient, enteral and parenteral nutrition should be supplemented. The digestive system function of early and middle stage lung cancer patients is sound. They should seize the time to supplement the organism with comprehensive nutrition in order to improve the body quality and strengthen the resistance. Meat, fish, eggs, milk, beans, rice and flour coarse grains, fresh vegetables and fruits should be chosen to provide rich protein, sufficient heat and adequate vitamins. General daily consumption of cereals 200g ~ 500g, dairy 250ml, meat, fish and eggs 125g ~ 250g, soybeans and products 50g, vegetables 400g ~ 500g, fruits 100g ~ 200g, the choice of vegetables, should be more nutrient-rich red, orange, dark green vegetables, leafy vegetables to have a certain amount, more with the consumption of edible mushrooms that can increase immunity, such as Mushroom stew with duck, confit chicken with cloud fungus, etc. Note that vegetables and fruits should not be interchanged. Cooking should be done in an easily digestible way such as stewing, boiling, simmering, steaming and stir-frying. Diversification of meals and small number of meals are helpful to increase appetite and quantity of food and promote digestion and absorption. There is no basis for the idea of starving the tumor.