3. Based on the findings, establish selection standards for the timing of surgery to treat PSP by VATS and establish technical specifications for performing operations on different types of lung bullae. The goal is to improve the diagnosis and treatment of PSP so as to reduce the recurrence rate of pneumothorax, reduce the trauma of operation, shorten hospital stays and postoperative recovery time, and provide better services for returning to everyday life and improving the quality of life for patients.