When there is fluid in the chest cavity, pumping is done according to the nature of the pleural fluid and the amount of fluid. The patient should be placed in a sitting position while the pleural fluid is being pumped, or in a semi-sitting position if the patient is in poor physical condition. The amount of fluid should be clarified by CT examination before aspiration, and the location of the puncture should be determined. The location of puncture is mostly located in the 7th~8th intercostal space of the subscapularis angle line or the posterior axillary line, and the 6th~7th intercostal space of the mid-axillary line. Before pumping, the appropriate puncture point should be selected according to the results of chest CT, and the principle of asepsis should be strictly adhered to for disinfection, toweling, local anesthesia, and puncture operation. Pumping should not be pumped cleanly at one time, and should be carried out according to the patient’s condition, and the frequency of pumping should be 2-3 times/week until the pleural effusion disappears. If pleural effusion is performed due to pyothorax, the pleural fluid (the fluid that stays in the thoracic cavity) should be pumped out at one time as much as possible; when the pleural effusion is large, the volume of the first pumping should be less than 600ml, and each pumping in the future should be less than 1,000ml, so as to avoid the occurrence of pulmonary edema or respiratory failure. When pumping for pleural effusion, we should pay attention to the patient’s physical changes, and stop pumping in time if there is any abnormal situation to avoid accidents.