After hanging surgery for anal fistula, pulling the thread every day belongs to one of the ways of tightening the thread. Specifically whether to tighten the line, tighten the line frequency is related to the patient’s condition performance and so on. The treatment of anal fistula with hanging wire, mainly through the leather band slowly cut the sphincter tissue, to avoid cutting the anal sphincter too quickly, resulting in postoperative incontinence and other symptoms. If in the process of recovery, the skin band is loose and can not cut, it is often necessary for the doctor to tighten the line again to achieve the therapeutic purpose. Therefore, in the daily change of medicine, give pulling the line, also belongs to a way of tightening the line, but also make the wound drainage, promote wound healing. Professional doctors need to operate, can not be operated by themselves, to avoid straining the wound, causing infection. After anal fistula surgery, it is recommended that patients should change the medicine on time to avoid abnormal proliferation of granulation tissue or bacterial infection affecting wound healing. If there is any discomfort, timely review as soon as possible to give treatment, to avoid affecting the normal recovery after surgery.