In advanced stage of lung cancer, the survival time can be about 1~3 months through drug treatment, and the survival time without treatment is about 1~2 weeks. Patients with advanced lung cancer have difficulty in eating, which indicates that the systemic function is relatively low, malignant state and hypoproteinemia exist, and serious heart and lung infections as well as respiratory failure are prone to occur. Coughing, sputum, blood in sputum, even fever, accompanied by pleural effusion are all easy to aggravate the patient’s systemic failure symptoms. At this time, nutrition can be supplemented by nasal feeding gastric tube, and high nutritional therapy can be given intravenously, through these two treatments, the survival time can reach about 1~3 months, on the contrary, without treatment, the survival time is very short, only about 1~2 weeks. If the patient is unable to eat, please give fluids to supplement nutrition in time to avoid further aggravation of the condition.