Anal fistula a fistula with two leather bands is to increase the effectiveness of cutting. Anal fistula is a common disease in the anorectal department, if the perianal abscess is not treated in time, further development will form anal fistula. The main manifestation is that there will be abscesses around the anus, secreting purulent secretions, stimulated by the secretions, there will be itching, pain and other discomfort around the anus. Hanging thread therapy is a commonly used method of anal fistula treatment, in the lesion area with a leather band ligature, using the elasticity of the rubber band, instead of a sharp knife to slowly cut the muscle tissue of the fistula. The use of two leather bands will increase the speed, strength and effectiveness of the cut, but after the bands are loosened, it is important to go to the hospital to tighten the threads and restore the tightening effect. Patients are advised to follow the treatment strictly under the doctor’s supervision, during which they should go to the hospital regularly for review and tightening of the stitches to keep an eye on the local healing.