1.Patients should be placed in supine position, or semi-recumbent or sitting position if they cannot lie down, and cooperate with the nurse for skin disinfection and pre-anesthesia treatment; 2.When inserting the bronchoscope through one nostril or mouth, the patient should swallow and breathe deeply according to the doctor’s instruction. After insertion of the bronchoscope, if it is not tolerated, the patient can raise his hand to indicate, but do not grab the tube; 3. The doctor decides whether a walking biopsy, irrigation, etc. is needed according to the examination; 4. After the examination, the doctor withdraws the mirror.