Constipation is not a disease, but a symptom of many diseases. Constipation has many causes and is very difficult to diagnose and treat. In recent years, through defecography, anorectal manometry, colonic transmission time measurement, pelvic floor electromyography and other technical examination means, a new type of constipation has been discovered, called outlet obstruction type constipation. It is characterized by the presence of obstructive factors at the exit of the pelvic floor during defecation, some of which can be surgically eliminated or relieved. However, the presence of multiple factors at the exit often makes treatment difficult and requires comprehensive consideration when dealing with it. The main symptom is difficulty in defecation, poor emptying and obstruction at the anus, and a few patients need to put pressure around the anus to defecate, or even use their fingers to dig out the fecal mass in the rectum. Some patients have symptoms of blood in the stool and anal pain. Treatment first requires non-surgical treatment, such as dietary therapy, taking 30g of bran and 2000~3000ml of water daily, eating more vegetables and fruits, taking laxatives if necessary, and increasing sports. If conservative treatment is not effective, consider surgical treatment. 2, rectal prolapse for incomplete rectal prolapse, occult rectal prolapse, the clinical diagnosis of this disease is extremely difficult, because in rectal diagnosis and sigmoidoscopy, the set of more reset, only in defecation easy to find, so fecal imaging can help diagnose. Treatment should first be conservative treatment, such as guidance diet, drinking more water, eating more fibrous food, regular bowel habits, if necessary, the use of suppositories and enemas, long-term conservative treatment is not effective, before considering surgery. 3, other causes include Isolated rectal ulcer syndrome Perineal descent syndrome Puborectalis syndrome