The purpose of fiberoptic bronchoscopy mainly includes identifying the cause of hemoptysis, sputum aspiration, alveolar lavage, clamping of foreign bodies, biopsy and so on. 1. For unexplained hemoptysis, fiberoptic bronchoscopy can be used to find the lesion of hemoptysis and treat the bleeding point under the microscope. 2. For elderly patients who have difficulty in coughing up sputum, fiberoptic bronchoscopy can be used to aspirate and expel sputum to prevent sputum from obstructing the respiratory tract. 3. To diagnose unexplained connective tissue disease, alveolar lavage can be performed by bronchoscopy and then sucked out for examination. 4. For patients who mistakenly swallow a foreign body to block the airway, ciliopathic microscopic operation can be taken to clip the foreign body to relieve the obstruction of the airway. 5. Fiberscope can be used to clip the mass in the lung, and frozen biopsy can be performed to clarify the nature of the mass. 6. Tracheoscopic interventional operation and treatment, such as balloon dilatation, stent implantation and so on. Fiberscope is a very important means in the diagnosis and examination of respiratory diseases, and has important value and significance in diagnosis and treatment. It is recommended that patients with respiratory system should go to regular hospitals in time, and standardize the diagnosis and treatment under the guidance of doctors, so as not to delay the condition.