24 cases of patent ductus arteriosus were experienced from Aug. 1977 to October 1983, at the department of thoracic surgery. Chungnam National University Hospital. Patent ductus arteriosus is one of the common congenital heart disease and the diagnosis can be made easily and simply. Interruption is done by thoracic surgeons and it is considered on of the simple separation. 1. Age ranged from 10 month old to 19 year old. 2. Sex ratio [male to female] was 1:2. 3. Diagnosis was made by the finding of the physical examination, chest X-ray, E.K.G., and Cardiac catheterization. 4. Operation was performed with double ligation and transfixion suture ligation at 23 cases, division was one case. 5. Postoperative recanalization was occurred in one patient, who had subacute bacterial endocarditis. [KTCS 1983;4:492-497]