PPH is a new procedure guided by the modern concept of hemorrhoids, i.e. the theory of inferior displacement of the anal cushion. PPH indications: 1. Circumferential prolapsed internal hemorrhoids of degree III and IV, recurrent bleeding internal hemorrhoids of degree II. PPH treatment for prolapsed hemorrhoids is performed by circumferential resection of the mucous membrane of the hemorrhoid through the hemorrhoid anastomosis to move the anal cushion upward, and by resection and ligation of the terminal branches of the inferior rectal artery and vein, so that the blood supply to the hemorrhoid is reduced and the nucleus of the hemorrhoid gradually atrophies. Because PPH only removes the mucous membrane and submucous tissue of the lower rectum, no incision is left in the anal canal and perianal area where sensory nerves are abundant, theoretically reducing postoperative pain. Because the anastomosis is located above the anorectal ring, the chance of sphincter injury is relatively reduced. PPH treatment principle: 1.Suspension: (fixation) Remove the mucous membrane and submucous tissue above the displaced anal cushion, and reposition and fix the anal cushion by contracting and pulling the suspension through the scar. 2.Cutting off the flow: (Reduce the flow) Remove the mucous membrane and submucous tissues above the displaced anal cushion, and at the same time suture off the superior rectal artery to reduce the blood flow to the anal cushion and stop the bleeding. 3.Reduction of accumulation: ①Suture closure of the main blood supply of the anal cushion to improve the stasis of the anal cushion and reduce the volume of the anal cushion. ②Lower the position of the pouch, directly remove the upper 1/3 of the anal cushion and reduce the accumulation. Advantages of PPH: PPH surgery has shorter operation time, less postoperative pain, faster recovery and fewer complications compared with traditional surgery.