Nerve block anesthesia, also known as conduction anesthesia, is a method of temporarily blocking nerve conduction function by injecting local anesthetic into the paramedic nerve trunk to achieve pain-free surgery. Nerve block anesthesia uses less drug, has a wide range of anesthesia, low risk of anesthesia, long duration of action, and the patient is awake and maintains intraoperative communication with the surgeon. Nerve block anesthesia is mainly applied to the human extremities, hands, feet, below the groin and axillae, with the extremities being its strong point. In addition, some minor procedures on the body surface can also be performed with nerve block anesthesia. The advantage of nerve block anesthesia is that it eliminates pain during surgery by anesthetizing the nerves, uses less drug, has a wide range of anesthesia, and has a long duration of action. For some patients or diseases not suitable for local anesthesia or general anesthesia, nerve block anesthesia can be used, but for some major surgeries, only anesthesia of the nerves is not enough, but also the central suppression, it is necessary to use general anesthesia. There are two main contraindications to nerve block anesthesia: First, the patient has severe hypokalemia or a recent episode of coronary artery disease. Second, the skin at the puncture site is infected or ulcerated or the peripheral nerves are diseased. If nerve block anesthesia is performed with contraindications, it can cause infection or loss of nerve function and neuropathy, and when it must be done, the diseased skin and diseased nerve should be avoided.