Tracheoscopic sputum aspiration operation process for preoperative preparation, preparation of irrigation fluid, into the mirror sputum, alveolar lavage. 1. Preoperative preparation: 8 hours before the operation, fasting, drinking, 30 minutes before the operation with 2% lidocaine nebulized inhalation of superficial anesthesia airway, the establishment of venous access, high-flow oxygen intake, cardiac electricity, blood oxygen saturation monitoring. 2. Prepare irrigation solution: sterilized saline about 200ml, warmed to 37.0℃. 3. Entering the mirror for sputum aspiration: enter the mirror through the nose, inject 2% lidocaine through the working hole of the tracheoscope, spray the vocal folds to fully anesthetize the vocal folds, then enter the trachea, and in accordance with the routine of bronchoscopy, enter the mirror while spraying the surface anesthesia with 2% lidocaine in the trachea, bronchus, and segmental bronchus, and fully aspirate secretion and sputum embolus in the lumen of the tube seen. 4. Alveolar lavage: 10 segmental bronchial orifices on the left and right in turn were subjected to alveolar lavage, 10 ml of each segment was lavaged and attracted as much as possible, and the total amount of lavage was 200 ml. Any invasive operation is risky, it is recommended to be treated in a professional hospital.