We clinically evaluated 182 cases of the ventricular septal defect that we experienced at the Department of Thoracic and Cardiovascular Surgery, Maryknoll Hospital from March 1986 through June 1990. Of the 182 cases, 95 patients were male and 87 patients were female. Their age distribution ranged from 8 month to 37 years and their mean age was 8.1 years. The most common chief complaint was frequent upper respiratory infection. Among them, 46 patients had associated cardiac anomalies, which were subdivided as follow; 9 cases of patent foramen ovale, 8 cases of infundibular stenosis, 6 cases of pulmonary valvular stenosis, 4 cases of left superior vena cava, and etc. The most common preoperative abnormal EKG finding was left ventricular hypertrophy in 22 cases. Ninety-three patients[51.1%] underwent simple closure of the VSD and the rest[48.0%] underwent patch closure. In anatomical classification by Kirklin type I constituted 24.2%; type II, 74.8%, type III, 0.7%, and the mixed type of type I and II, 0.5%, The important postoperative EKG changes were noted in 38 cases[20.9%], 18 cases of which were incomplete right bundle branch block. Thirty-three patients[18.1%] developed minor and major complications, and five patients died, overall operative mortality being 2.7%.