The anesthesia machine is the Anesthesia machine circuit will be sent to patients with alveolar anesthetic, formation of anesthetic gas pressure, diffusion into the blood after the direct effect on the central nervous system, resulting in the effect of general anesthesia. The anesthesia machine belongs to a semi open anesthesia device. It is mainly composed of anesthesia vaporizer, flow meter, folding bellows, ventilator breathing circuit (including inhalation and exhalation one-way valve and manual air bag), corrugated pipe components.