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The laryngeal mask is used for general anesthesia surgery, and the breathing passage to ensure the breathing of patients. The laryngeal mask can seal the laryngeal cavity and the laryngeal cavity, so as to prevent laryngeal secretions from entering the laryngeal cavity and affecting the respiratory function of patients under general anesthesia. The central laryngeal mask has a breathing passage directly connected to the laryngeal cavity, and the distal end is connected to the ventilator to maintain the breathing of patients. Unlike endotracheal intubation, the laryngeal mask is inserted into the trachea through the larynx to avoid injury to the larynx cavity, dislocation of the arytenoid joint, and damage to the tracheal mucosa. It is suitable for general anesthesia operations on other parts of the body except for upper respiratory tract operations.