Postoperative pain, slow wound healing, anal stenosis, and fecal incontinence are common complications of traditional hemorrhoid surgical treatment. For the treatment of severe hemorrhoids (Ⅲ, Ⅳdegree), traditional methods include sclerosing agent injection and ligation, etc., which are often associated with intolerable anal pain and recurrence, etc. In 1998, Italian scholars, such as Longo and others, reported that according to the new theory of the formation of internal hemorrhoids, the treatment of stage 2 and stage 3 circumferential prolapsed hemorrhoids through the circular excision of mucous membranes and submucosal tissues of the lower part of the rectum was a new method — anastomotic hemorrhoidectomy. -Anastomotic hemorrhoidectomy. At the beginning of this century, it was widely popularized in China. PPH is suitable for all kinds of hemorrhoids, especially patients with severe internal hemorrhoids and partially prolapsed rectal mucosa. Its principle is: Preserve the anal cushion, part of the internal hemorrhoids and hemorrhoids on the mucous membrane, submucosal tissue ring excision anastomosis at the same time, instantaneous anastomosis. Both blocked the blood supply of hemorrhoids, but also the slipped tissue suspension fixed, the pathological state of the anorectal tube to normal anatomical state. Due to the arteries located in the submucosa supplying hemorrhoids are cut off at the same time, the hemorrhoid blood supply is reduced after the operation, and the hemorrhoidal mass gradually shrinks in about 2 weeks after the operation. Characteristics of PPH: Significantly reduces postoperative pain; Significantly reduces postoperative bleeding; Significantly shortens hospitalization time; Significantly speeds up the recovery cycle; Significantly improves the therapeutic effect; Significantly improves the quality of life. PPH surgery has the following advantages: 1, significant improvement of preoperative symptoms and cure; 2, short operation time; 3, short hospitalization time; 4, fewer postoperative complications; 5, short recovery time; 6, it can improve the sensory obstruction due to anatomical variations in the anal canal area, and improve the patient’s ability to control the bowel movement.