High complex anal fistula is not healed six months after surgery, may be related to poor healing, infection, fistula recurrence and other conditions. 1. Poor healing: high complex anal fistula surgery requires regular disinfection and medication change, usually about two months to gradually recover. If accompanied by tissue fluid oozing and pain, it may be that the local care is not appropriate, the surface skin healing, but the inside wound continues to rot. 2. Infection: by the high complex anal fistula in the fistula is more, the recovery is slow, do not pay attention to the premise of cleaning, may form an infection, you need to clean up the decayed tissue in a timely manner. If not cleaned up in time, it may lead to the spread of infection, repeated infection, affecting the normal recovery time. 3. anal fistula recurrence: anal fistula surgical treatment still has the probability of recurrence, if the patient is accompanied by anal moisture, itching and secretion overflow phenomenon, considering the anal fistula has recurred. It may be related to the dead space left after surgery, the formation of pseudo-tracts and so on. It is recommended that patients after anal fistula surgery, if the traumatic manifestations of poor or prolonged healing, to timely medical review, as soon as possible to give appropriate treatment to avoid aggravation of the condition.