Abstract: Objective:To assess the value of multi-slice spiral CT with multi-planar reformation and curve-planar reformation post-processing techniques in the diagnosis of mechanical small bowel obstruction.Methods:the entire abdominal MSCT was performed on 36 bowel obstruction patients,who had been made a definite diagnosis by operation,pathological confirmation through colonoscopy or clinical clear diagnosis.Retrospective thin-slice reconstruction 0.625 mm to 1.0 mm after multi-slice spiral CT scan,the techniques such as MPR,CPR and MIP,were used to observe the dilated bowel,transition zone,mesenterium in order to estimate the location,the cause of obstruction and the blood supply of the intestinal tube.Results:21 of the 36 cases were with adhesive intestinal obstruction and 7 of them were with intestinal tumor.The location and the causes of the 5 cases with inflammatory ileus were all clear diagnosed,1 case with gallstone ileus,1case with inguinal hernia and volvulus in 1 case were also determined.The rates of correct diagnosis were 92%.Conclusion:The different angle MPR and CPR of MSCT is added to transaxial images which could help to definite the cause,location,characteristics obstruction.MSCT examination and post-processing techniques are a preferred investigative method in confirming the locations and causes of the bowel obstruction in clinic.