Pediatric intussusception is an acute abdominal condition caused by persistent spasm of a section of intestine into the adjacent distal intestine due to intestinal dysfunction, and is the most common cause of intestinal obstruction in infants and children. In the early stage, it is simple intestinal obstruction, but in the late stage, due to the compression of mesenteric blood vessels, the blood supply to the intestinal canal is impaired, resulting in bruising, edema and necrosis of the intestinal wall, forming strangulated intestinal obstruction, which can seriously cause death. The disease is mostly seen in healthy obese children, infants and toddlers under 2 years old, especially obese boys from 8-10 months. It is rare in newborns and children over 5 years of age. 95% of the cases are primary, and the ileocolic type (i.e., ileocecal sleeve into the colon) is common, accounting for 80% to 85% of cases. Clinical symptoms and signs are abdominal pain, vomiting, bloody stool and abdominal bag fast. Children with these symptoms should be seen in the hospital immediately. Most of the previous treatment is air and barium enema reset under X-ray, and the child will be injured. After the whole procedure is completed, there is a possibility of receiving the radiation equivalent to taking 300 to 500 ordinary X-rays. Moreover, parents and relatives who are accompanying the child at the side will also be damaged by X-rays to varying degrees. In addition, because of the low-temperature gas and airflow cause adverse stimulation of the intestinal wall, once perforation occurs can cause sudden shock and even death. The water temperature is 37-40 degrees Celsius, which is close to the normal body temperature, and the water pressure is evenly transmitted, which is less irritating to the intestinal wall and quicker to reset. Even if perforation occurs, the problem can be solved by immediate surgery without life threatening. During the whole reset treatment, high-frequency ultrasound imaging technology provides a new and safer method for the diagnosis and treatment of this disease, and the confirmation rate is up to 100%. The ultrasound follows the whole process in a timely manner, and the images are clear and intuitive, so that the doctor can know exactly the child’s breathing, abdominal distension and general condition at any time, and accurately grasp the indications for continuing enema or changing to surgery, which ensures the child’s life safety and the success of treatment. It not only allows the child to receive a clear diagnosis before receiving enema treatment, but also avoids damage to the child from X-rays. For the diagnosis and treatment of pediatric intussusception, ultrasound is a better method to diagnose and participate in the treatment than x-ray. If an enema is unsuccessful, repeat enemas can be given after the child is quiet and may still be successful. The resetting effect is good and the success rate is high (81.67%), and those who reach more than 48 hours or more than 72 hours in particular increase the chance of surgery (11.67%) due to the high possibility of intestinal necrosis. This indicates that early diagnosis is the key to successful treatment with hydroperfusion repositioning. For children with an onset time of more than 48 hours and poor general condition, in addition to active preparation for surgery, systemic treatment such as acid correction, anti-inflammatory, supportive and symptomatic treatment should also be actively given. Because of the advantages of easy operation, intuitive, safe and radiation-free, light complications and fast repositioning, the treatment of pediatric intussusception by water pressure enema under ultrasound surveillance is generally accepted by the majority of doctors and patients and has a broad application prospect.