目的　探讨CT检查对儿童小肠机械性梗阻的诊断价值。方法　分析 31例手术确诊为小肠机械性梗阻患者的腹部X线平片与CT表现。年龄 9个月至 14岁 ,男 17例 ,女 14例。急性小肠梗阻 2 9例 ,慢性小肠梗阻 2例。其中 7例有腹部手术史。结果　腹部X线平片与CT准确显示梗阻程度分别为 19例和 2 9例。CT准确显示梗阻病因 18例 ,包括小肠石 4例 ,肠套叠 5例 ,腹腔局部感染渗出粘连 6例 ,腔内型肠重复畸形 1例 ,先天性脐疝 1例 ,先天性肠旋转不良 1例。本组 7例有腹部手术史者全部为粘连性梗阻 ,结合手术史 ,CT准确判断病因 2 5例。腹部X线平片与CT假阴性诊断分别为 4例和 2例。结论　CT对发现肠绞窄和肠壁积气的敏感性较腹平片高。CT显示狭窄移行段的形态有助于判断病因 ,对梗阻病因的判断CT明显优于腹部X线平片。可为临床确定治疗方案提供比较可靠的依据 Objective To investigate the diagnostic value of CT in diagnosis of small intestinal obstruction in children. Methods 31 cases of surgical diagnosis of small intestinal mechanical obstruction in patients with abdominal plain radiography and CT findings. Aged 9 months to 14 years old, 17 males and 14 females. Acute intestinal obstruction in 29 cases, 2 cases of chronic intestinal obstruction. Seven of them had a history of abdominal surgery. The results of abdominal plain radiography and CT showed that the degree of obstruction was 19 cases and 29 cases, respectively. CT showed the exact cause of obstruction in 18 cases, including 4 cases of small intestine, intussusception in 5 cases, abdominal peritoneal exudative adhesions in 6 cases, 1 case of intracavitary intestine deformity, congenital umbilical hernia in 1 case, congenital intestinal malrotation 1 case. The group of 7 patients with abdominal surgery history are all obstruction, combined with surgical history, CT accurately determine the cause of 25 cases. Abdominal X-ray and CT false negative diagnosis were 4 cases and 2 cases. Conclusion CT was found to be more sensitive to abdominal strangulation and gut wall than abdominal plain film. CT showed that the morphology of the narrow segment of the transition helps to determine the cause of the obstruction of the cause of the judge CT was significantly better than the plain X-ray film. It can provide more reliable basis for clinical treatment plan