Delayed wound healing means that the wound does not heal successfully within the appropriate time frame after surgery, leaving an unhealed wound. Normal healing time: about 4 weeks (30±5 days). A total of 1856 cases of hemorrhoid fistula surgery were collected from our hospital in the past two years, 1571 cases healed within one month and 285 cases took more than 40 days to heal. Second, the causes of delayed wound healing 1, too much excised skin or flap edema, poor drainage, intraoperative application of electric knife, slow wound growth, or even zero growth. 2.Inflammatory infection of the trauma surface, ulcer formation, producing medical fissures, sphincter spasm, and prolonged healing of the trauma surface. 3, the presence of potential foci of infection, sinus dead cavity or wire knot foreign body affects normal healing. 4.Anal fistula surgery is not properly explored and searched to the internal port, and misprobing produces infection in the competent part of the false channel pseudo-internal port and the branch, and the sinus cavity remains. 5, too early and frequent activities after surgery, drug changes, improper methods of anal expansion, long-term dry stool can affect healing. 6.Special lesions such as mycoplasma, chlamydia, tuberculosis, actinomycosis infection, diabetes, cancer, etc. 7, physical factors, poor general condition, anemia, malnutrition, low immune function, etc. (1) Case selection: Strict examination before surgery. For those who are weak, malnourished or suffering from serious systemic diseases, it is not advisable to rush to surgery and wait for the systemic condition to improve before performing surgery. (2) Surgical operation: The surgical operation must be perfect, not only to completely remove the lesion tissue, but also to reasonably design the incision, i.e. not to remove too much tissue, nor to leave too long skin redundancy, and to strictly operate aseptically. (3) Postoperative treatment: The water temperature of the postoperative bath should not be too high, and the fumigation time should not be too long, otherwise it may affect the healing of the wound. (4) Systemic nutritional support treatment. (2) Local treatment (1) Non-traumatic treatment: ①Apply sensitive antibiotic sand strips such as gentamicin and metronidazole externally to the wound, or select the appropriate antibiotics for the bacterial culture results of the wound secretions. ②myogenic drug use: Chinese medicine myogenic powder, pearl powder, etc., Western medicine epithelial or fibroblast growth factor. ③Analgesic drugs to relieve the spasm of anal sphincter. ④Local physical therapy to improve blood circulation. ⑤ Reduce secretion irritation and treat eczema. (2) Traumatic treatment: ①Remove the hematoma and remove the foreign body. (2) Make the wound drainage smooth, remove necrotic tissue and form a fresh wound. (3) Local anesthesia with methylene blue plus lidocaine to release sphincter spasm and prolong wounds for anal dilation and drainage. ④If the trauma does not heal for a long time in a patient with anal fistula, the cause should be found. Some high complex anal fistulas with deep sinus cavities may take longer to heal, but those that do not heal for a long time, or those with pseudo-bridging healing, must be re-dilated and drained.