Analgesic pump is a computer-controlled microinfusion device commonly used in clinical anesthesia for perioperative analgesia, which uses opioid analgesics or enzyme analgesics in combination with anti-vomiting drugs internally to achieve the purpose of reducing the pain of trauma caused by surgery. Generally, the anesthesiologist sets a background dose of constant infusion per hour, and on the basis of the background dose, when the patient feels severe pain, he/she can press the add button PCA button by himself/herself and then add a certain dose of anesthetic analgesics once. Of course, the additional dose cannot be unlimited, and it is very dangerous to overdose anesthesia, so the doctor will set a safety limit of 15-20 minutes, that is, within 15-20 minutes, press the add button 2 times in a row, and actually add only 1 time of medicine to ensure the safety of the patient. Within the safety limit, the goal of individualized analgesic drug use is achieved as much as possible according to individualized differences. Clinical use for many years has proven this protocol to be better.