Bronchoscopy is needed in the following cases: 1) Diagnosis of diseases: including unexplained cough, hemoptysis, unexplained masses and space-occupying lesions, pleural fluid in the lungs, etc., which need to be clarified through bronchoscopy; 2) Treatment of diseases: in the past, some serious lung infections need to be treated through bronchoscopy by aspiration; in addition, for the purpose of clarifying the lung diseases, such as tumors in the bronchi of the lungs or foreign bodies in the bronchial tubes, it is necessary to carry out bronchoscopic examination, and to remove the tumors of the lungs to achieve the therapeutic effects of the bronchoscopic excision.