The standardized name of bronchofiberscope is fiberoptic bronchoscopy, and its examination serves to diagnose and treat bronchial and lung diseases. 1. Diagnosis: fiberoptic bronchoscopy can detect neoplastic organisms such as tumor tissues in the airways, and at the same time conduct tracheoscopic biopsy of suspected tracheal masses for pathological tissue analysis. Alveolar lavage fluid detection means can be used to observe the condition of the lesions in the lungs, and culture the pathogens, has clarified the type of pathogens of infectious lung diseases. 2. Treatment: Abnormalities that can be directly observed for treatment can be treated by microscopic treatment, the use of argon helium knife, etc. for more serious lung tumor tissue direct resection. Fiberoptic bronchoscopy can be used to aspirate sputum and remove foreign bodies from the airways. Fiberoptic bronchoscopy needs to be operated by professionals, and the indications and contraindications must be strictly controlled.