The methods of general anesthesia for surgery include inhalation general anesthesia, intravenous general anesthesia, and static-absorption compound general anesthesia. 1. Inhalation general anesthesia: gaseous anesthetics such as ammonia oxide inhaled through the respiratory system, or isoflurane and other volatile anesthetics through the lungs, the body circulation to reach the central nervous system so as to achieve general anesthesia effect. 2. Intravenous general anesthesia: Intravenous injection of general anesthetics such as sedatives such as propofol, analgesics such as fentanyl, muscle relaxants such as succinylcholine, etc., so as to achieve sedation, analgesia, muscle relaxation, loss of consciousness, etc. to achieve the role of general anesthesia. 3. Static-aspiration compound general anesthesia: the method of using inhalation anesthetics and intravenous anesthetics together. The selection method of general anesthesia is the result of judgment and comprehensive analysis by professional anesthesiologists.