The way to judge the complete exhaustion of pneumothorax is as follows: 1.If conservative treatment is carried out, the patient has no chest tightness and other symptoms; 2.The general surgeon wears a stethoscope and finds out whether the breath sounds on both sides are symmetrical by auscultation, especially whether the breath sounds on the affected side are improved than the original. Because the gas to the pleural cavity breath sounds are reduced, while percussion is drum sound; 3, imaging examinations: such as film or review CT, if no gas is found, the diagnosis of complete absorption can be clear; 4, if closed chest drainage is performed, the drainage tube is placed through surgery, there is no gas leakage in the drainage tube after coughing, and no gas is drawn by puncture, which can prove that there is no gas inside, the lungs are open, and the chest drainage tube can be removed.