There is no such thing as good or bad discharge after anal fistula surgery, but rather a normal or abnormal situation. Generally there will be more blood secretion within 10 days after surgery, which is normal. If there is purulent secretion, generally a small amount is normal, purulent secretion is large and yellow, sticky, accompanied by a foul odor, is an abnormal situation. Anal fistula surgery is generally to cut the fistula, belong to the open wound, postoperative bloody secretion may be more, especially within ten days after the operation. After actively changing the medicine, filling gauze drainage in the surgical opening site, usually ten days to half a month after the bloody secretion will gradually reduce. A small amount of purulent discharge after anal fistula surgery is normal and may be wound secretion, intestinal fluid or necrotic tissue. If it is a large amount of pus, it means that there may be an abscess cavity that has not been dealt with, and at this time, the doctor needs to check again whether there is any missing abscess cavity. If patients find abnormal secretion after surgery, they should inform the doctor in time, and at the same time, they can follow the doctor’s instruction to use 1:5000 potassium permanganate solution warm water sitz bath or Chinese medicine sitz bath every morning and evening, which can be conducive to the absorption of local inflammation and dissipation.