Objective To summarize the CT findings of gastrointestinal neuroendocrine neoplasm (GI-NEN), so as to improve its diagnostic accuracy. Methods The CT findings of 36 cases of GI-NEN confirmed by pathology were analyzed retrospectively. The following features such as tumor location, size, growth pattern, boundary, thickness of infiltrative lesions, ulceration, cystic change or necrosis, enhancement character, invasion of serous membrane and adjacent organ, lymphadenopathy, peritoneal seeding, distant organ metastasis were reviewed, and were compared with their pathological changes. Results The average diameter of 36 cases of GI-NEN is 45mm. 15 cases located in stomach, 4 cases located in duodenum, 17 cases locatedin rectum. 2 cases were infiltrative growth, 14 cases were circumscribed growth, 10 cases occured ulceration, 14 caes showed cystic change or necrosis, 29 cases showed marked enhancement, layering enhancement appeared in 12 cases, 21 cases invasion into serous membrane, sadjacent organs invasion occured in 13 cases, regional lymphadenopathy occued in 13 cases,3 cases showed peritoneal seeding, 8 cases occurred distant organ metastasis. Conclusion GI-NEN has some characteristic features on CT, CT plays an important role in diagnosis for GI-NEN.