Pain is painful and causes a series of physiopathological changes in the organism. Patients are afraid of surgery, mostly because of the fear of postoperative pain. Continuous analgesia is difficult to achieve using traditional methods, while analgesic pumps can. Recognizing Pain Pain is a physiological phenomenon experienced by everyone; falls can be painful, as can illness. In 2002, the 10th World Congress on Pain recognized pain as the “fifth most important vital sign of the human body” and that persistent pain may be a disease requiring treatment. In medicine, the pain that humans can feel is divided into 12 levels, and the higher the level, the greater the pain felt. Among these 12 levels, the pain sensation above level 9 is close to the limit of pain that humans can accept, and the highest level, level 12, is exactly when the mother gives birth, and the mother has to suffer great pain due to the oversized head of the baby. Pain is a simple stimulus, but in fact it can cause a series of pathophysiological changes in the body, such as: the impact on the autonomic nervous system: accelerated heart rate, shortness of breath, increased blood pressure; mental changes leading to irritability and depression, which then affects the function of the digestive system, physical recovery; endocrine, hormonal effects, directly and indirectly make a variety of body The endocrine and hormonal effects directly and indirectly cause various body functions to change. What is the postoperative analgesic pump Whenever surgery is mentioned, few people are not afraid, one of the reasons is the unbearable pain after surgery. Surveys have found that about 95% of surgical patients are worried, anxious and upset by the fear of pain, and in some cases, panic and increased blood pressure. Postoperative pain makes them afraid to breathe hard, cough and turn their position, and secretions are not easily discharged, causing pulmonary atelectasis and lung infection. For a long time, people think that postoperative pain is inevitable, and the traditional analgesic method is only the injection of morphine, dulcolax and other analgesic drugs, but there are disadvantages such as short analgesic time and the need for repeated medication. In recent years, a new technology has emerged in clinical pain treatment – drug pump technology, the drug delivery scheme is shifted to be given by the patient himself, that is, the patient himself uses the drug pump “PCA self-controlled analgesic pump”. The number of presses and the dosage of the PCA can be self-regulated by the patient, so that the analgesic can be “supplied on demand”. It can achieve the best effect with the smallest dose and the smallest side effects, avoiding the traditional method of large fluctuations in blood concentration and side effects. This is another embodiment of modern technology for the benefit of patients. The role of analgesic pump 1, reduce patient pain is the main purpose. Pain as the fifth vital sign has been more and more people understand, and it is the basic right of patients to ask for no pain. 2.Walkable epidural analgesia does not affect the patient’s free movement, increasing the patient’s comfort and improving the hospital’s service level.