Gas anesthetics, that is, inhalation anesthetics, can enter the lung tissue through the respiratory tract or anesthesia machine, and act on the brain after metabolism in order to play the role of inhibiting the central nociceptive nerve, the amount of inhaled drugs is larger to achieve the effect of anesthesia, the earliest application in the history of anesthesia is ether, but the nature of ether is extremely unstable, and flammable, explosive, clinical has been abandoned. At present, the most used inhaled anesthetic drugs are halothane, such as sevoflurane, which is characterized by aromatic taste and is easily accepted by children, and children will cooperate with inhalation during anesthesia, which is conducive to the successful completion of surgery and has less psychological impact on children. The specific medication should be combined with the clinical situation and guided by the doctor’s face-to-face consultation.