Brachial plexus anesthesia belongs to a kind of nerve block, some postoperative precautions of anesthesia mainly include: I. Some anesthetic accidents of nerve block anesthesia drugs, such as neurotoxic reaction of local anesthetics and delayed local anesthesia drug poisoning. Second, the postoperative respiratory depression caused by sedative drugs, also need to be observed, if no sedative drugs, this can be disregarded. Third, after the brachial plexus nerve block, the patient’s muscles, especially the shoulder joint muscles are more relaxed, usually need to be suspended or go back to the family care must pay attention to, because the patient is not aware of their own, more relaxed, if the degree of activity is relatively large, may cause the shoulder joint dislocation, which may be a little more common.