The exact site of aspiration auscultation is mainly in the chest, with six auscultation points, from top to bottom, where the midclavicular line intersects with the second and fourth ribs, the mid-axillary line intersects with the sixth and seventh ribs, and the left and right lungs are symmetrical, corresponding to the lung tip, the hilum and the lung base. Aspiration is a nursing operation that adopts the principle of negative pressure to aspirate airway secretions, clean and unblock the airway to improve respiratory function and avoid respiratory distress and respiratory failure caused by phlegm blocking the airway. Before aspiration, laryngeal or sputum sounds can be heard at the point of auscultation, and the operation should be gentle and the negative pressure should not be too high to avoid loss of tracheal mucosa and aggravation of tracheal bleeding. The trachea should be kept moist and in a lying position during aspiration, otherwise it is easy to make the sputum or foreign body difficult to be sucked out, and the patient’s breathing should be closely observed during its process.