The hanging wire method has been used since the Ming Dynasty. Xu Chunfu cited the hanging wire technique for anal fistula in the Ancient and Modern Medical System, which was developed by Chen Shigong in the book Surgery, and gradually became the incision and hanging wire method, which is a classic way of treating anal fistula in Chinese medicine and has played an important role in clinical practice to date. It has the advantages of simplicity, economy, not affecting the function of the anus, small scar, and smooth drainage. The mechanism is to use the mechanical effect of the ligature thread to slowly strangle the canal with the pressure or contraction force generated by its tight binding, giving the broken end a chance to grow and produce inflammatory adhesions with the surrounding tissues, thus preventing the occurrence of anal incontinence caused by the sudden fracture and retraction of the rectal ring of anal canal. As an adjunct to incision or excision of complex anal fistulas, rubber bands are currently used instead of silk threads, which can shorten the course of treatment and reduce postoperative pain. Rectal flap hanging wire therapy: Treatment of outlet obstruction type (rectal type) constipation can replace resection therapy for one-stage simultaneous treatment in order to avoid intestinal perforation and bleeding. With a deep foreign body clamp clamp straight needle with medicine thread through the rectal flap estimated incision site, remove the suture above by the proctoscope exit, medicine thread outside the mirror knot, with homemade deep ligature will be knotted tightly, in order to achieve tissue ischemic necrosis open purpose. In the clinic, we also often encounter some cases of complex anal fistula, combined with incision, hanging thread, open, etc., we observe a phase I cure rate is quite satisfactory, for a large number of patients to solve the long-standing pain of the disease.