As a screening technique or for preoperative staging of the colorectal cancer, the usefullness of role of CTstill remains controversial. The study included retrospective analysis of 40 cases of proven colorectal cancerduring last 2 years. The results were as follows: 1. The age of patients ranged from 22 to 74 years, 5th and 6th decades were over the half (52.5%) of the cases. 2. Rectum and sigmoid colon were the most frequently involved regions (23 cases, 57.5%). Other areas were 9 cases of transverse colon and each 4 cases of ascending and descending colon. 3. In every cases, the primary tumor was identified on CT as wall thicknening. Diffuse wall thicknening type was noted in 32 of 40(80%) cases. Remaninings were each 4 cases of focal wall thickening type anddiscrete mass type. 4. Directly invaded organs were uterus(2 cases) and jejunum(1 case). 10 patients had distant metastasis, and the liver were most frequent organ of involvement(9 of 10 cases). 5. Among 40 cases, 34 cases were pathologifcally staged following surgery. CT results were compared and correlated with modified Duke's classification. CT correctly staged 19(55.9%) and understaged 14(41.2%) of 34 cases. 6. For the evaluation oflocal extension, CT accuracy was 73.5% with 75% sensitivity and 50% specificity. 7. For the diagnosis of lymphnode metastasis, CT accuracy was 82.4% with 70% sensitivity and 100% specificity.