Most of the bronchoscopies can confirm the diagnosis of tuberculosis, the diagnosis of tuberculosis should find the basis of the existence of tuberculosis bacilli, and the clinical practice is usually based on sputum culture and sputum tuberculosis bacilli smear to find tuberculosis bacilli. However, for some bacteria-negative patients with tuberculosis, it is necessary to brush the local bronchial tubes and alveolar lavage through bronchoscopy, and obtain sputum specimens for corresponding sputum examination, and if the tubercle bacilli are found, the diagnosis of tuberculosis can be confirmed. In some patients with tuberculosis, typical necrotic granulomas can be seen on the inner surface of the airways, and the diagnosis can be confirmed by biopsy of the localized necrotic material. However, it should be noted that a small number of patients with tuberculosis whose bronchoscopy does not show obvious abnormalities can also be biopsied by percutaneous lung puncture of the lung lesions. In conclusion, bronchoscopy is a positive and effective way to diagnose tuberculosis.