Chronic anal fissures can usually only be cured by surgical intervention. If non-surgical treatment of acute anal fissure is ineffective, or if the fissure is more than 8 weeks old and forms a chronic anal fissure, surgical intervention is usually required. The most commonly used is partial internal sphincterotomy, which relieves or eliminates spasm by severing a portion of the internal sphincter muscle in order to heal the fissure, but there is a risk of anal incontinence associated with this procedure. In addition, there is anal fissure resection, that is, through the surgery to remove all the anterior hemorrhoids, hypertrophied anal papilla and ulcerated fissure, forming a fresh wound, and then combined with warm water sitz baths to promote wound healing; if the anal fissure fissure is relatively large, it can also be used to flap grafting of the skin around the anal canal. It is recommended that patients with chronic anal fissure should follow the doctor’s instructions to standardize the treatment, and at the same time, eat more vegetables and fruits containing fiber, which can play an auxiliary role in controlling the condition, maintaining the therapeutic effect, and promoting the recovery of the disease.