Intussusception is a condition in which part of the intestine and its ligament are snapped into the adjacent intestinal cavity, mostly in a paracentral fashion, i.e., the proximal intestine is snapped into the distal intestinal cavity. In pediatric clinical ultrasound diagnosis, intussusception is more common in infants and children. The causes of infantile intussusception are not well understood and may be related to anatomical factors such as long mesentery and high mobility during infancy, and may be triggering factors when dietary changes or diarrhea lead to intestinal dysfunction. Infantile intussusception often manifests clinically as paroxysmal abdominal pain, crying, vomiting and jam-like stools, and some children may have palpable sausage-like masses. Sometimes it is difficult to make a diagnosis by clinical manifestations alone. Ultrasonography can make up for the lack of clinical diagnosis. Because of the thin abdominal wall in children, when the abdomen is scanned with a high-frequency probe, the intestinal masses in the transverse section show a ? The “concentric circles” sign and the “sleeve” sign in the longitudinal section have characteristic performance. Color Doppler flow imaging can reflect the blood circulation status of the intestinal cavity, which can provide the basis for clinical selection of different treatment plans. Ultrasound examination is easy, quick, non-radiological, non-invasive, repeatable, followable and low cost, and has a high diagnostic accuracy, so it is the first choice of examination method for infant and child intussusception.