There is collected cases report of esophagus diverticulum .treated at the dept. of Thoracic & Cardiovascular surgery of National Medical Center During the past 21 years from 1960 to 1981 . The total number were l0 cases in consideration of their sites, the pharyngoesophageal diverticulum was only one, the cervical esophageal diverticulum one, the mid thoracic diverticulum were Six, and the epiphrenic diverticulum were two. And their pathogenetic analysis revealed 6 in traction type, and 4 in pulsion type. The investigation and analysis have been done in comparison with current concept of esophageal diverticulum. [KTCS 1981;4:364-368]