The time of detachment depends on the tightness of the rubber band and the number of sphincter muscles ligated, and in clinical practice, it can be detached in 10-14 days. It is not normal to detach an anal fistula in three days, considering that the ligation of the tissue is too little or too tight ligation. In the clinic, the detachment in three days is considered to be caused by too little ligated sphincter tissue and too tight rubber band ligation. Premature detachment loses the role of chronic cutting of anal fistula hanging thread, which can easily lead to fecal incontinence of the patient. In addition, hanging wire therapy also plays a role in trauma drainage, premature detachment is likely to lead to poor drainage within the wound, and then the formation of pseudo healing. When there is an anal fistula hanging line three days on the detachment of the situation, it is recommended to timely follow-up by a professional doctor for specific conditions to give appropriate treatment to avoid delays in the condition.