In adults, the normal anatomical length of the ascending colon is 15 cm, transverse colon is 55 cm, descending colon is 20 cm, and sigmoid colon is 40 cm. If the length exceeds the normal value and the range of activity increases, the diagnosis of colonic redundancy can be made. In China, the majority of patients have redundant sigmoid and transverse colon, most often in the sigmoid colon, accounting for 63.4%. The condition of colonic redundancy is complex, and there are no uniform diagnostic criteria, and the diagnosis of the disease is based on the following points: (1) The medical history includes symptoms of long-term persistent constipation, abdominal distension and abdominal pain. General medical treatment is not effective. (2) X-ray barium enema is the main basis and important tool for the diagnosis of colonic redundancy. Indications for surgery are: (1) Long-term persistent constipation, seriously affecting work and life, with a defecation cycle of 4 d or more. (2) Complications such as intussusception, intestinal torsion, intestinal obstruction or intestinal perforation. (3) Those who have had poor results after active non-surgical treatment for more than 1-2 years. (4) Barium X-ray enema suggests that the colon is curved and extended or bent and redundant more than 35%-40% of the normal length, it is estimated that the non-operative effect is not good, and surgery is also appropriate. The diagnosis of sigmoid redundancy is mainly based on clinical symptoms and barium enema X-ray, and the diagnosis of sigmoid redundancy can be made when the barium enema X-ray shows that the length of the sigmoid colon is more than 45 cm and the range of movement reaches the right lower abdomen or upper abdomen. Persistent constipation is due to the long and curved sigmoid colon, excessive absorption of water in the stool, which makes the stool dry and difficult to be excreted, as well as sigmoid torsion due to the long colon. This disease does not require treatment if there are no constipation symptoms, but those who have long-term persistent constipation can be considered for surgical treatment after non-surgical treatment is ineffective. Complete resection of the diseased colon and mesentery is the preferred and effective treatment for sigmoid redundancy with intractable constipation. Most sigmoidectomies, transverse colectomies and left hemicolectomies are performed, and the results of surgical treatment are very satisfactory for 6 months to 3 years in the near term, but there is a certain recurrence rate in the long term.