The methods of intravenous anesthesia include basic anesthesia and intravenous general anesthesia, as follows: 1. Basic anesthesia refers to the elimination of patient’s tension and consciousness before surgery to create conditions for other anesthetic methods, such as preoperative intramuscular injection of midazolam or Valium, which can make patients have a paracrine amnesic effect. Basic anesthesia itself has no analgesic effect, and must be implemented with other anesthesia methods; 2. Intravenous general anesthesia is anesthetic drugs injected into the body through a vein, which acts on the central nervous system through blood circulation and produces general anesthesia. This kind of general anesthetic has analgesic effect and can be used alone or with inhalation anesthesia. At present, we more often use static inhalation compound anesthesia, that is, inhalation of certain anesthetic drugs, coupled with intravenous general anesthesia, so that with the use of this can reduce the amount of anesthetic drugs, increase safety, so that patients in a relatively short period of time after the withdrawal of drugs quickly wake up.