Intussusception is a condition in which a portion of the intestinal tube and its mesentery is lodged into the lumen of a neighboring segment of the intestine. It is one of the most common acute abdominal disorders in infancy and childhood, with onset between the ages of 6 months and 2 years. The condition is acute and rapidly changing, and ischemic necrosis of the intestinal tube can occur, requiring timely and appropriate diagnostic and therapeutic approaches. Literature reports that the four major symptoms and abdominal pain (paroxysmal crying), vomiting, bloody stools, and abdominal mass coexist in 60-70% of typical cases, while atypical cases often see only 1-3 of these signs. The resolution of conventional frequency ultrasound of the abdomen is poor, and the diagnosis rate of intussusception is not high, which is easy to cause misdiagnosis. Using high-frequency color Doppler ultrasound diagnosis, compared with the traditional X-ray air and barium enema, real-time ultrasound diagnosis of intussusception has a characteristic sonogram performance, and its accuracy can reach more than 95%, which is the first choice of diagnosis of intussusception, non-invasive and safe examination methods. In secondary cases, the primary pathology that induced intussusception can be explored, including Meckel’s diverticulum, intestinal duplication malformation, intestinal polyps, and thick-walled intestinal tubes in abdominal purpura. High-frequency color Doppler ultrasound long-axis view reveals mesenteric colored blood flow from the opening of the trochlea into the intestinal canal, which travels in multiple near-parallel strips of colored blood flow, and localized colored blood flow in the intestinal wall is increased compared with normal due to congestion and edema. The signal of blood flow on the mesentery was not obvious, which reflected that the longer the time of the socket, the more serious the edema and necrosis of the intestinal tube appeared. By observing the blood flow of the wall of the snapped intestine through CDFI, the degree of ischemia of the wall of the intestinal tube can be judged, which provides a reliable basis for the clinical choice of air enema reset or surgical treatment. Differential diagnosis 1, acute hemorrhagic enteritis Acute hemorrhagic enteritis has a rapid onset, starting with abdominal pain, mostly around the umbilicus or all over the abdomen, paroxysmal colic or persistent pain with paroxysmal aggravation. Often have chills, fever. Most of the patients have diarrhea, 80% of the patients have bloody stools, bloody watery or jam-like, sometimes purple-black blood stools. 60% of the patients have nausea, vomiting. About 1/4 of the patients are in serious condition, which can be accompanied by toxic shock. Physical examination has different degrees of abdominal distension, abdominal muscle tension and pressure pain, bowel sounds are generally weakened. Sometimes the mass with pressure pain can be palpated.X-ray abdominal plain film can see the small intestine dilatation, inflation and fluid level, the bowel gap widening shows that there is fluid in the abdominal cavity. 2.Other causes of chronic abdominal pain Adult intussusception often manifests itself as chronic recurrent episodes, and blood stools are less likely to occur. Mostly incomplete intestinal obstruction, symptoms are mild, manifested as paroxysmal episodes of abdominal pain. It should be differentiated from other causes of chronic abdominal pain such as chronic appendicitis. Treatment 1, pediatric intussusception is mostly primary, air or barium enema can be applied to reset. However, it is contraindicated for those who are suspected of intestinal necrosis. 2, enema method can not be reset or suspected intestinal necrosis, or secondary intussusception feasible surgical therapy. Specific surgical methods should be decided according to the investigation. No intestinal necrosis of the line of surgical reset; there are difficulties in cutting the neck of the outer sheath to make it reset, and then repair the intestinal wall; there is necrosis or a combination of other organic diseases, feasible intestinal resection anastomosis or fistula. Prevention 1, diarrhea should be avoided, especially in autumn diarrhea, parents should be highly alert to the occurrence of this disease. 2, usually pay attention to scientific feeding, do not overfeed, change food at will, add auxiliary food should be gradual, do not rush. 3, to pay attention to climate change, increase or decrease clothes at any time, avoid all kinds of bad factors that can easily induce intestinal peristalsis. 4.If a healthy infant or young child suddenly develops unexplained paroxysmal crying, pallor, cold sweat, vomiting, blood in stools, and mental instability, he or she should think about whether he or she may have intussusception. 5. The most important symptoms are abdominal pain, vomiting and jam-like bloody stools.