After anal fistula surgery, anal pain can be caused by pulling and squeezing the incision due to dry stool and difficulty in discharge and fecal impaction. In addition, diarrhea, fecal irritation, intestinal fluid, anal gland fluid and secretions from the incision can all lead to unbearable anal pain during postoperative stool. Treatment methods are as follows: 1. Adjust the diet, keep the stool loose and soft, do not eat spicy and stimulating food, and if necessary, take laxative drugs such as wheat bran, methylcellulose, lactulose and polyethylene glycol electrolyte dispersion orally; 2. Pay attention to dietary hygiene, do not be too greasy, avoid diarrhea, and when diarrhea is present, give Montelukast or Bacillus subtilis dibacterium enteric solution capsule orally; 3. Keep the perianal area clean and breathable, after stool If the above measures do not work well, you can give compound thornbush fumigant as well as fumigation with Chinese herbs that clear heat and detoxify pain, anal entry anal tide ointment, Ma Yinglong hemorrhoid cream, taining pessary, etc. Also can be appropriate oral pain medication, such as Lo-fen-zoin extended-release tablets, Xilabao, ibuprofen, etc.