Objective To evaluate CT findings of urinary obstruction caused by ureteral diseases.Methods CT findings in 157 cases with ureteral disease, proven surgically and pathologically were retrospectively reviewed.Results 27 cases of ureteral neoplasms, 12 casesof ureteritis, 10 of ureteral tuberculosis, 90 of ureteral stones, 3 of ureteral polyps, 3 of retroperitonium fibrosis and 12 cases ofretroperitonium or pelvic neoplasms involving ureter were included. Conclusion Spiral CT is of high accuracy in determining the natures and localizations of ureteral diseases.