Lung cancer effusion is clinically called lung cancer pleural effusion, which mostly suggests that the patient is in advanced stage. Pleural effusion in lung cancer patients may be caused by increased permeability of pleural capillaries and weakening of vascular barrier, which mostly suggests that patients are in advanced stage. When the symptoms are serious, the pleural effusion can be drained by puncture or intercostal tube drainage, and at the same time, chemotherapy, radiotherapy and targeted therapy can be adopted to alleviate the symptoms, improve the quality of survival and improve the quality of life of patients. Lung cancer patients should have early detection, early diagnosis and early treatment to improve the cure rate. They should pay attention to regular review, keep happy mood, avoid excessive pressure, exercise properly to improve immunity, and keep the living environment ventilated at the same time.