The stool needs to be thoroughly cleaned after anal fistula surgery, otherwise it can easily harbor bacteria that can cause or aggravate the infection and also affect the healing time. Specific steps include preparing the solution and measuring the water temperature, followed by sitz baths to make the perianal area clean and avoid infection. Sitz bath includes traditional Chinese medicine sitz bath, potassium permanganate solution sitz bath and so on. 1. Steps of traditional Chinese medicine sitz bath (1) Dissolve the Chinese herbal medicine powder in water, pour the liquid into the sitz bath basin 1/2 full, and measure the water temperature with a thermometer. (2) First use sterile gauze to clean the perianal area, wait until the water temperature is appropriate to sit in the bidet, buttocks completely soaked in water, about 10-20 minutes. This will sterilize the skin around the anus. 2. Potassium permanganate solution sitz bath steps (1) Dissolve potassium permanganate in water at a concentration of 1:5000, pour it into the sitz bath tub 1/2 full, and measure the water temperature, generally keep it at about 36~40℃. (2) Use sterile gauze to clean the perianal area, the water temperature is suitable to make the buttocks completely immersed in the solution for 10~20 minutes. This can remove the bacteria in the perianal area to achieve the purpose of cleaning, it should be noted that the concentration of the configuration should not be too high to prevent burns to the skin. Stool cleaning after anal fistula surgery, according to the condition, follow the doctor’s instructions.