The sphincter function of the anus is performed by the external anal sphincter, the anal raphe and the internal anal sphincter. The external sphincter is generally divided into three layers, namely the subcutaneous layer of the external anal sphincter, the superficial layer of the external anal sphincter and the deep layer of the external anal sphincter. Clinically, cutting off the subcutaneous and superficial layers of the external sphincter will not affect a person’s bowel movement. However, if the deep layer of the external anal sphincter is cut off, as well as the puborectalis and internal sphincter of the anal retentive muscle, the anus will be loosened and the control of the anus will be lost, resulting in incontinence of the bowels, prolapse of the rectal mucosa and other adverse consequences. The high anal fistula, especially the high anal fistula above the anal raphe muscle, not cut off the anal raphe muscle is very difficult to remove the lesion, so that the fistula is completely cured. Therefore, the treatment of high anal fistula is very complex and difficult, for this reason, domestic and foreign clinicians have done a lot of work, designed a lot of surgical methods, but these methods always have some big defects. China’s traditional Chinese medicine hanging thread therapy, the treatment of high anal fistula is more perfect.