Bronchoscopy is made of glass fiber and camera imaging mechanism, which is relatively soft and difficult to cause injury when entering the respiratory tract. Through bronchoscopy, we can understand the changes in the patient's lungs, and some patients may also experience hemoptysis or blood in sputum. This examination can better understand the patient's physical condition, clarify the cause of the disease, and find better treatment methods. 1. Bronchoscopy can clarify whether there are lesions and the location of the lesions in the trachea. Once the lesion is found, the nature of the lesion can be clearly understood through bronchoscopy biopsy. 1. Bronchoscopy can also be used for patients with symptoms such as cough, wheezing, hemoptysis or blood in sputum, and atelectasis. After the examination, the factors causing these diseases can be found. 2. When there is a clear case of lung infection, more severe cases can also be injected with antibiotics or irrigated with normal saline through bronchoscopy, which can also play a very good intervention role in the treatment of this disease. 3. Bronchoscopy has a high value in diagnosing symptoms such as tuberculosis, lung cancer, alveolar proteinosis, pulmonary dust, silicosis, and foreign bodies. 4. In addition, for some patients with tracheal intubation or tracheotomy, bronchoscopy can be used to observe whether there is sputum or aspirated food in the trachea, and the secretions in the trachea and bronchi can be removed through bronchoscopy.