Colonic diverticulosis in Korea was considered as a rare disease, but recently increasing tendency of colonic diverticulosis were reported, and right side preponderance was also noted compared with left side preponderance of western country. Authors reviewed 818 cases of colon study performed from jan 1 st, 1982 colon study. 2. Male is more frequently affected (32 out of 441.7, 7.2%) than female (13 out of 377, 3.5%) 3. 5th decade is the predilection age group but occurrence in younger age group is increasing. 4. Diverticulosis may occur single or multiple with variable size in entire colon except rectum but right side preponderance is remarkable. 5. Complications were observed in 6 cases (13.3%)