Although hemorrhoid surgery is very small and not a big surgery, the post-operative pain is very intense because the area around the anus is very rich in nerve endings and because the nerve endings are very rich, it is very painful after the surgery. It is more painful from 1-7 days after the surgery, especially in the 1-3 days after the surgery, hemorrhoid surgery is very painful, acute pain that some patients can hardly tolerate and even affects bowel movement and post-operative recovery. Therefore, the doctor will develop a post-operative analgesic program for the patient according to the patient’s pain threshold and physical condition to provide a good post-operative analgesia for 1-3 days after surgery, which is conducive to the patient’s post-operative recovery.