The anesthesia machine delivers anesthetics into the patient’s alveoli through a mechanical circuit to form a partial pressure of the anesthetic gas. After it is diffused into the blood, it directly inhibits the central nervous system and produces the effect of general anesthesia. The anesthesia machine is a semi-open anesthesia device. It is mainly composed of anesthesia evaporation tank, flow meter, folding bellows ventilator, breathing circuit (including inhalation and exhalation one-way valve and manual airbag), corrugated pipeline and other components.