Pain after liver cancer surgery is common and is mainly caused by the incision. In traditional open resection surgery for liver cancer, the incision is often very large and, therefore, very traumatic because the liver is under the diaphragm and a very large incision must be made to expose it, and the pain is often more severe. Pain can be relieved by postoperative analgesic drugs or epidural catheters, continuous administration of analgesic drugs, including peripheral intravenous administration of analgesic drugs. Nowadays, with the development of minimally invasive technology, the incision is smaller through minimally invasive surgery abdominal perforation. Part of the incision is made using the lower abdomen, so that the pain level is less than the incision in the upper abdomen of the liver, so minimally invasive surgery is actually a very effective way to relieve postoperative pain. Now there is also the ERAS technique, so-called ERAS, or rapid recovery surgery, which uses a series of analgesic drugs, and often the pain level is less. The pain level of traditional surgery can often reach more than 3-4 points, but now with minimally invasive surgery and ERAS technology, it can generally be controlled to less than 2 points.