The manifestation of intestinal obstruction on CT mainly shows that the intestinal canal is inflated and dilated, liquid and gas flat is also seen, the intestinal wall is thickened as well as the diameter of the intestinal canal will increase. It is still relatively sensitive and specific to the diagnosis of intestinal obstruction, and can assist in determining whether there is strangulation of the intestinal canal, as a supplement to abdominal plain film. In general, X-ray examination is the most common and effective means to diagnose intestinal obstruction, with a detection rate of up to 70%, and its air-fluid flatness and air-flattened intestinal collaterals are obvious at a glance, so clinically we will choose to use abdominal plain film examination first, and then further use CT or nuclear magnetic.