In this study, 213 cases of the spontaneous pneumothorax experienced at the department of thoracic and cardiovascular surgery, Chungnam National University Hospital during from April, 1977, till Dec, 1983 were reviewed. 1.Sex ratio of the studied patients was 7.19;1 showing high incidence male patients. The incidence according to the age group showed that 20.2%, 18.3% of the patients belong to the age group 6th, 5th decade respectively. 2.The etiologic factors were as follows, tuberculous origin in 50.2%, unknown origin in 28.2%, COPD in 3.3%, bullae in 8.5%. The site was right in 47.9% and left in 44.1%, bilateral in 8%. 3.The clinical symptoms were frequently dyspnea in 35%, chest pain in 27.5%. 4.The employed method of treatment were as follow, bed rest with oxygen inhalation in 1.9%, closed thoracostomy in 95.8%, open thoracotomy in 7.98%, which bullectomy was performed in 12 cases and pneumonectomy in 3 cases and lobectomy in 1 case and decortication with simple closure of bleb was performed in remaining 1 case. 5.The duration of closed thoracostomy was longer in tuberculosis, which average duration was 11.28 days. 6.The overall recurrent rate was 12.3%.