PPH surgery theory is based on the famous American doctor Thomson in 1975 put forward the “anal cushion under the” doctrine, anal cushion under the main content of the doctrine is: in the lower end of the human rectum there is an anatomical structure known as the anal cushion, trilobal, located in the dentate line to the top of the 1.5cm 2.5cm, which is innate, irrespective of race, men and women, the old and the young. Anal cushion mainly contains smooth muscle, elastic fibers, connective tissue, blood vessels, the surface is covered with fine nerves not a little, on the control of defecation, defecation has an important role. Anal cushion in long-term constipation, spicy food, alcohol, sedentary long squatting and other factors under the stimulation of prolapse can occur, and can be prolapsed out of the anus to form hemorrhoids, in the anal cushion in the process of prolapse, accompanied by its internal vascular tortuous, dilation, thinning, bleeding.