Anal fistula is an infectious disease of the perianal area that requires surgical treatment options. Simple superficial fistula, can choose fistula incision, excision and suture. The high complexity of the fistula need to be incised and hanging line therapy, after surgery can also be manifested as perianal moisture, secretion, as well as the anus has a liquid outflow, may be through the mouth, need to be further explored. Anal fistula is prone to recurring episodes and recurrence after surgery. During the operation, the inner mouth should be explored exactly, and after the operation, it is necessary to change the medicine intermittently, and the inner mouth should be fully exposed every time the medicine is changed, and the local secretion can be gradually reduced, and every time the medicine is changed, it is necessary to thoroughly disinfect and clean the wound, and it is necessary to cooperate with the anti-infective treatment in the acute period after the operation, and it is possible to insist on the local fumigation with warm saline, and the sitz bath.