The diagnosis of primary small bowel tumors can be a challenge for both clinician and radiologist because of their vague or non-specific clinical presentation and its anatomic characteristics. A retrospective study was made in 44 patients who had the proven primary tumors of small bowel by pathologist to identify radiologic characteristics during recent 7 years. There were 16 cases of adenocarcinoma, 15 cases of lymphoma, 9 cases of leiomyosarcoma, 2 cases of leiomyoma, and 2 cases of hamartomatous polyp. 1. Adenocarcinoma was irregularly annular proximal bowel mass with 4cm in mean length92-7cm in range) and bowel dilatation in 56%. 2. lymphoma frequently showed annular distal bowel wall mass with 7cm in mean size93-15cm in range), aneurysmal ulcer in 31% and lymphadenopathy in 42%. 3. Leiomyosarcoma was lobulated exophytic bulky mass with 10cm in mean size(7-15cm in range), associated with necrotic low density area in 785. 4. leiomyoma revealed smooth, avoid filling defect w thout necrotic area in duodenal lesion, and a large septated cystic mass in jejunum. 5. Hamartomatous polyp showed multiple polypoid filling defects and intussusception, associated with polyps in large bowel.