Anal function protection is the premise and foundation of any surgery or treatment, that is, “function first, cure second”, and it is necessary to find the balance point between function and cure. It is necessary to find the balance between function and cure, which is the most beneficial point for the patient. It is important not to cause irreparable damage to anal function, such as anal stenosis and incontinence, in order to pursue the so-called radical cure. 2.Anal therapeutic requirements: The relief of the patient’s disease symptoms and pain through surgery is the primary and direct requirement of the patient’s medical treatment, and is also the key to measuring the success of a surgery. 3.Anal morphological requirements: “The human anus is a masterpiece of human long evolution and God’s work of art!” It is not only a channel for excretion, but also a motor organ with keen senses. Therefore, a fine and successful anal surgery, more normal tissue preservation, less postoperative scarring, less anal displacement, also reduces the chance of local sensory abnormalities and defecation disorders after surgery. 4.Anal cosmetology requirements: the design of reasonable surgical incision, the use of minimally invasive surgery and minimally invasive concept, the trimming and fixation of preserved skin bridge, and the application of anoplasty will make your postoperative wound look so refreshing. Therefore, anorectal surgery is precious to do fine work so as to maximize the radicality, reduce complications and maintain the sphincter function of the anus!