When pneumothorax occurs, the patient should not take the lying position, but should take the semirecumbent position and lateral position. When lying down, the patient’s abdominal organs and diaphragm will be lifted up, which will reduce the volume of the lungs, and at the same time, due to the patient’s pneumothorax, the affected side of the lung tissue will be compressed, the degree of chest tightness and shortness of breath will be aggravated, which will lead to respiratory difficulties. Lying down will increase the volume of return blood, thus increasing the pressure of pulmonary circulation, and may also aggravate the symptoms of chest tightness to varying degrees, especially in elderly patients with heart disease. Patients with pneumothorax should keep the affected side lying position, because the affected lung has been compressed in pneumothorax, at this time the healthy side of the lung plays the main respiratory function, such as the healthy side of the lying position may limit the activity of the lungs, thus aggravating the symptoms of asthma. At this time, the patient has been treated with closed chest drainage, can take the semi-recumbent position, at this time the position required to let the drainage port in the upper position, in order to facilitate the exhaust can be, with the improvement of the pneumothorax and the cure, the position can be gradually transitioned to the horizontal position.