1, delayed expulsion of fetal stool, persistent constipation abdominal distension children have different clinical manifestations depending on the length of the lesioned intestinal tube. The longer the spastic section, the earlier and more serious the constipation symptoms appear. Most of them have no fetal stool or only a small amount of fetal stool within 48 hours after birth, and may develop symptoms of low-level partial or even complete intestinal obstruction, vomiting and abdominal distension without defecation within 2-3 days. If the spastic segment is not too long, a large amount of feces and gas can be excreted after rectal examination or warm saline enema and the symptoms are relieved. If the spastic segment is not too long, the obstructive symptoms are not easily relieved, and sometimes emergency surgery is needed. After the symptoms of intestinal obstruction are relieved, there is still constipation and abdominal distension, and it is necessary to frequently dilate the anus and enema to defecate, and in serious cases, it develops into no enema and no defecation, and the abdominal distension gradually increases. 2, malnutrition and stunted development long-term abdominal distension and constipation, can make the child’s appetite decreased, affecting the absorption of nutrients. Stool accumulation makes the colon hypertrophy and expansion, the abdomen can appear wide intestinal type, sometimes can be palpable feces-filled intestinal collaterals and fecal stones. Rectal finger examination: a large amount of gas and loose stool is discharged with the finger plucking. 3, megacolon with small bowel colitis is the most common and serious complication, especially in the neonatal period. Its etiology is not clear. The child’s generalized fever suddenly deteriorates, with severe abdominal distension, vomiting and sometimes diarrhea. Due to diarrhea and the accumulation of large amounts of intestinal fluid in the enlarged intestinal canal, it produces dehydration and acidosis with high fever, fast fat and decreased blood pressure, which can cause high mortality if not treated in time. 4, examination (1) biopsy to take more than 4cm from the anus rectal wall submucosa and muscle layer a small piece of tissue, pathology confirmed the presence of ganglion cells. (2) X-ray shows mostly low-level colonic obstruction on standing abdominal plain film. The typical spastic intestinal segment and dilated intestinal segment can be seen in the lateral and anterior-posterior pictures of barium enema, and the barium discharge function is poor, and the barium still remains after 24 hours. If the diagnosis is still not confirmed, the following tests will be performed. (3) anorectal manometry 4. electromyography examination slope type low, low frequency, irregular, wave peak disappearance. 5. Treatment (1) Conservative treatment is applied to children with ultra-short congenital megacolon disease, neonates. (2) Colostomy is applicable to newborns with failed conservative treatment or patients with severe condition or not available for radical surgery; (3) Radical surgery is applicable to all children with megacolon disease. (3) Radical surgery is indicated for all children with megacolon disease. (1) Swenson’s procedure involves removal of the entire affected area and anastomosis of the normal bowel at the proximal anal level. (2) Soave procedure The entire lining of the rectum is pulled out and the outer layer of the affected rectum is preserved and snapped into the normal intestine. (iii) Duhamel procedure Dorsal-dorsal anastomosis of the uninvolved bowel end to the rectum at the anal level. For short spastic bowel segments and mild constipation symptoms, comprehensive non-surgical treatment can be used first, including regular bowel lavage with isotonic saline (equal volume of irrigation in and out is required; avoid using hypertonic or hypotonic saline or soapy water), anal dilation, glycerin suppositories, slow laxatives, and treatment with acupuncture or herbal medicine to avoid fecal accumulation in the colon. If the above methods of treatment are not effective, although the short segment of the giant colon should also be treated surgically. The most used surgeries are ① drag-out rectosigmoidectomy (Swenson′s surgery); ② drag-out surgery after colonic resection of rectum (Duhamel′s surgery); ③ rectal mucosa stripping colon in the rectal muscle sheath Xian drag-out resection (Soave′s surgery). If the child has acute small intestinal colitis, critical image or nutritional development disorder and cannot tolerate a radical surgery, intravenous rehydration and blood transfusion should be performed to improve the general condition before performing radical surgery, and if the enteritis cannot be controlled and the abdominal distension and vomiting are more than one, enterostomy should be made in time and radical surgery should be performed later.