Before anal fissure surgery, it is necessary to pay attention to diet and activity, psychological care and bowel preparation, and after surgery, it is necessary to pay attention to observing the condition, changing medicine care and bowel care. 1. Before surgery (1) Diet and activities: patients should be instructed to have a normal diet, keep bowel movement, drink more water, eat more high-fiber food, increase the amount of exercise appropriately, promote intestinal peristalsis, and develop the habit of regular defecation. (2) Psychological care: patients should be kindly communicated with patients, so that they can understand the preoperative preparations and possible reactions during and after the operation, and cooperate with the operation with a healthy mind. (3) Intestinal preparation: eat dinner from 4:00 p.m. to 5:00 p.m. on the 1st day before surgery. start drinking purgatives at 6:00 p.m., and start fasting and abstaining from food and water after 10:00 p.m. In the morning of surgery, defecate with 0.2% soapy water 500ml large amount of unreserved enema. 2. After surgery (1) Condition observation: monitor the patient’s temperature, pulse, respiration and blood pressure according to medical advice after surgery, and observe whether the patient has any bleeding manifestations. (2) Medication change nursing: Give the patient a medication change treatment after surgery. Evaluate the patient’s wound condition when changing medicine. After changing medicine, observe the patient’s pain, bleeding, and whether the patient has fever. (3) Defecation care: in order to reduce postoperative bleeding, it is advisable to start defecation 24h after surgery, and flush the wound in time after defecation to prevent infection. Anal fissure surgery precautions, specifically listen to the advice of the doctor in charge, and actively cooperate with the treatment.