Because the intestinal tract is easy to accumulate gas, ultrasound is easily affected, so the first choice for intestinal examination is not ultrasound, but ultrasound can also play a certain role in suggesting intestinal diseases. In vitro ultrasound examination of the intestinal tract is generally through the body surface, the abdominal cavity of intestinal lesions, including intestinal lesions, including the size, location, morphology, invasion of the level, the scope of involvement, infiltration infiltration and metastasis, and so on. In vivo intestinal ultrasound can be performed through the built-in ultrasound probe for direct exploration, such as diseases related to the rectum, through the rectum direct exploration, according to the intestinal laxity to determine whether the lesion occurs and so on. There are advantages and disadvantages of all kinds of imaging tests, so patients need to choose the most appropriate test under the professional guidance of the doctor in order to find out the cause of the disease.