Abstract: During the period 1980-1992，101 canes of primary small intestinal tumor were treated surgi-caly and proven phathologicaly. among them，74cases were malignant (adenocarcinoma 51，lym-phosarcoma 6，leiomysarcoma 6 and others 11) and 27 benign (leiomyoma 18, lipoma 4 and others 5).The tumors were located in ileum in 19. jejunum in 30, duodenum in 52. Because of their rarity and lack of characteritic feature.the preoperative diagnostic accuracy was only 35.6% in this series. It is mandatory to perform hypotonic double contrast and endoscopy on individuals of suspicion as early as possible，but should be combined with other methods in order to improve diagnostic aceura-cy.