If pulmonary effusion occurs after chemotherapy, pulmonary effusion can be sent for examination to clarify the nature of the effusion, and symptomatic treatment can be carried out. If pulmonary effusion occurs after chemotherapy, consider pleural effusion, at this time, it is feasible to use closed drainage of the thoracic cavity, and extract the effusion and send it to the laboratory for examination, so as to clarify the nature of the effusion. If the pleural effusion is malignant pleural fluid, indicating the emergence of pleural metastasis, can be thoracic instillation of chemotherapeutic drugs, such as cisplatin, etc.; if inflammatory pleural fluid, give anti-inflammatory treatment, such as ceftriaxone sodium. Drainage of pleural fluid can be standardized to relieve the patient’s symptoms. In addition, pleural effusion drainage is prone to hypoproteinemia, so it is necessary to regularly review liver function and timely supplementation of albumin. Usually pay attention to light diet, try to choose fish, lean meat, eggs, milk, fresh vegetables and fruits and other nutritious food.