Pneumothorax oxygen flow rate is 3 L/min. Pneumothorax is formed after the rupture of large pulmonary alveoli, and the symptoms of dyspnea, chest tightness and chest pain appear when the gas compresses the lung, so a chest X-ray should be performed. If the amount of pneumothorax is greater than 30%, closed chest drainage is given for treatment. In addition, low-flow oxygen inhalation can be given to alleviate the patient’s dyspnea symptoms, which is beneficial to the recovery of the disease and helps to alleviate the patient’s fear and make the patient heal as soon as possible. After the closed drainage is placed, a chest CT examination should be performed after the lung is reopened, and if there are large pulmonary alveoli, thoracoscopic wedge resection of large pulmonary alveoli with pleural fixation should be performed, and the pneumothorax will not be easy to recur after the surgery.