Lung fluid in the advanced stage of squamous lung cancer needs to be treated with drainage, radiotherapy, chemotherapy and other treatments. Pulmonary effusion, also known as pleural effusion, is a more common complication in advanced stage of squamous lung cancer, which needs to be treated according to the amount of effusion and the patient’s physical condition: 1. Drainage, large amount of fluid will bring great pressure on lungs and heart, causing chest tightness and pain, so it is necessary to drain the fluid in time to relieve the symptoms, meanwhile, it is also necessary to use cisplatin, bleomycin and other thoracic cavity perfusion treatments. 2. Radiotherapy and chemotherapy, while symptomatic treatment, systemic anticancer treatment should not be missing, radiotherapy and chemotherapy should be carried out under the guidance of doctors to stabilize the condition and eliminate the problem of fluid in the lungs.