Critically ill, old age or general anesthesia is not awake patients, respiratory tract may be secretions, vomit and other obstructions, but there breathing, lips cyanosis, pale and breathing difficulties and other symptoms. If not promptly airway foreign body aspiration, the patient may be due to severe obstruction leading to respiratory failure, suffocation. suction method: via mouth, nasal catheter suction, bronchoscopy suction, tracheotomy suctioning and mouth suction. electric vacuum suction apparatus suction catheter method: connect power, turn on the switch, check whether the performance of good unobstructed suction. the suction tube into the mouth, cheek, throat and trachea, the secretions of the exhaustion. there are difficulties, such as oral suction, may be inserted nasal suctioning. suctioning when the action gentle suction pipes up from the deep right rotation suggested that sticky sputum aspiration is not easy when feasible, inhalation, use the phlegm drugs, and can shoot back to help suction. pediatric suction catheter should be small, suction should be small. suctioning time, preferably 10-20 seconds, repeat 3-5 minutes once again to suctioning. suction tubes after going to the disinfection and sterilization to prevent cross-infection.