High hanging thread therapy refers to the use of rubber bands or corrosive medicinal thread mechanical compression, cutting effect, slowly cut the anal fistula fistula therapy, to reduce the anal sphincter damage, applicable to low or high simple anal fistula, but also as an adjunctive treatment for complex anal fistula. The hanging wire therapy procedure does not cause severe anal incontinence. After hanging the thread, the ligated muscle tissue due to mechanical compression occurs blood flow obstacle, gradually necrosis, disconnection, but the healing muscle will be due to fibrosis and the surrounding tissue adhesion, the severed end of the muscle will not be retracted too much, which effectively protects the damage to the anal sphincter, and can achieve the therapeutic purpose after gradual healing. Hanging wire therapy in clinical application, in addition to not causing serious anal incontinence, but also has the advantages of simple surgical operation, less bleeding, less painful dressing change, etc., the clinical development is more extensive. Anal fistula is a common clinical anorectal disease, once it occurs, should be timely to the regular hospital, under the guidance of professional doctors for standardized and reasonable diagnosis and treatment, to avoid aggravation of the condition.