Three patients with congenital diaphragmatic eventration have been reported. The diagnosis was established by chest radiography which showed an abnormally elevated diaphragm. Additionally fluoroscopy, ultrasonography and pulmonary function tests were used. Diaphragmatic plication was performed in order to restore normal pulmonary parenchymal volume and the diaphragm was replaced in its normal localization. All the patients had been discharged in good condition following uneventful postoperative courses. In this study we discussed the etiology, diagnosis, treatment and postoperative courses of diaphragmatic eventration.