The next day after surgery basically can change the medicine, according to the specific use of different surgical methods, the frequency of changing the medicine can be different. 1. anal fistula incision or excision, is the whole fistula complete cut or excision, damage, the formation of fresh wound, can be placed to avoid false healing drainage tube; the second day after surgery can be considered to change the medicine, bleeding can be changed twice a day to keep clean and prevent infection. 2. through the sphincter between the anal fistula ligation, generally 2 to 3 days after surgery to change the medicine, and then about 3 days to change once, half a month basically do not need to change the medicine. 3. anal fistula hanging line surgery, there is a band cutting sphincter, at the same time can play the role of drainage, basically will not form a pseudo healing, change the medicine is not necessary too often, basic 2 ~ 3 days to change the medicine, followed by a good local hygiene and cleanliness, change the medicine according to the condition of the flexibility; focus on the post-breakfast and before bedtime to warm water sitz bath and pulling the band, to promote the perianal blood circulation, clean the traumatic wound, disinfection and anti-inflammatory, conducive to the recovery of the trauma. Postoperative dressing change is mainly for monitoring the wound and preventing infection, which should be operated by professional medical personnel, and abnormalities should be dealt with in time to avoid affecting the normal postoperative recovery.