Anorectal stenosis is broadly classified as congenital stenosis, pathological stenosis, and medically induced stenosis, and is characterized by small anorectal caliber, which can be seen in both men and women, and manifests as varying degrees of dyspareunia. The diagnosis can be confirmed by a clinical history of dyspareunia combined with local examination. If it is difficult to determine the segment of stenosis, barium enema can be used to help confirm the diagnosis. The appropriate treatment is chosen according to the degree and type of stenosis. In cases of mild stenosis, repeated and durable anal dilatation is used to restore normal bowel function in most cases. Severe stenosis requires surgical treatment, and the timing of surgery should be chosen before the onset of obstruction if possible. For simple stenosis of the anal canal, septal resection is feasible; for stenosis of the anal canal, longitudinal incision and transverse suturing or Y-V flap formation can be chosen to enlarge the caliber of the anal canal; for stenosis of the anal canal junction, stenosis release is very effective because the stenosis is annular in shape. Rectal stenosis and anal canal rectal stenosis Because of the wide extent or high location of the lesion, it is often difficult to operate from the perineum, and it is not easy to achieve the goal by reluctantly using stenosis release, and there is still a possibility of scar stenosis after surgery, so it is appropriate to use abdominal perineal anoplasty. In addition, anal dilatation is required after various surgical treatments, usually starting 2 weeks after surgery and continuing for 3 to 6 months until the anal canal can pass through the index finger and defecation is unobstructed to prevent scar contracture and re-stenosis. I. Anal dilatation: It is suitable for mild anorectal stenosis and after various kinds of anorectoplasty. In the lateral or truncated position, a special metal probe, or a pen rod of suitable size with a round solitary shape for a few days before the top, coated with lubricant, is slowly inserted into the rectum from the anus and left in place for 15-29 minutes once a day for the first month, and then gradually changed to once every other day or twice a week according to the improvement of defecation difficulties, generally lasting for about 6 months. The probes are made from small to large until the stenotic segment can pass smoothly through the index finger, and bowel movements are unobstructed and maintained without recurrence. The parents of the child should be taught to operate it by themselves, and they should regularly visit the hospital for review and consultation and receive the doctor’s finger layer, and the key should be long-term kidney. If repeated dilation still can not maintain normal defecation, must promptly choose other surgical methods of treatment. Second, septotomy: remove the septal ring of stenosis, retain the anal margin flap appropriately, free the skin of the anal canal slightly, and then suture with the anal margin flap when crossed, so that the incision is star-shaped after suturing, to prevent the healing scar contracture stenosis. Longitudinal incision and transverse suture: Longitudinal incision of the skin and subcutaneous tissue on the posterior side of the anus, up to the upper edge of the stenosis and down to 1 cm outside the anal verge; dilate the anus so that the index finger can pass through the anal canal, free the subcutaneous around the incision, and suture the mucosa of the posterior rectal wall and the skin of the anal canal transversely and intermittently. Fourth: Y-V flap formation of the anal canal: an inverted Y-shaped incision is made in the posterior side of the perianal area in the truncated position, with the center located at the anal verge, the internal incision of the anal canal needs to be super stenosed, and the external incision of the anal verge is about 2 cm long with an angle of 90º~100º. The anus is dilated so that the anal canal can accommodate the index finger, and the extra-anal triangular flap is fully freed and moved up into the anal canal with counter sutures, and the incision is inverted V-shaped after suturing. V. Stenosis release: Expose the stenotic ring at the anorectal junction through the anus, generally make a longitudinal incision on the posterior side of the ring, cut the stenotic fiber ring, expand the stenotic area of the anal canal to be able to pass the index finger, then slightly free the rectal mucosa, and suture the upper and lower mucosa of the incision together transversely. If the degree of stenosis is heavy, additional incisions can be made on both sides of the ring to facilitate relaxation.