The purpose of electronic bronchoscopy is categorized into 3 main areas: identification of the cause, definitive diagnosis, and treatment. If it is suspected that the lung disease is caused by the infection of special bacteria or pathogenic bacteria, the alveolar lavage fluid can be rapidly infiltrated through the electronic bronchoscopy to do the aetiological examination, including bacteria combined with the identification of fungi related microorganisms, to clarify the cause of the disease, so as to target the choice of antibiotic treatment. For patients with unexplained prolonged coughing, coughing up blood, chest tightness and shortness of breath, electronic bronchoscopy can be used to find out whether the patient has airway stenosis leading to airway obstruction and thus dyspnea. Electronic bronchoscopy can also be used to directly reach the site of the disease and remove the lesion, and then the disease can be clarified through pathologic examination. In addition, treatments such as removing endotracheobronchial foreign bodies, helping to create artificial airways, treating endobronchial tumors, treating benign endobronchial stenosis, placing endotracheal stents, and removing mucous secretions from the tracheobronchial tubes can also be performed through electronic bronchoscopy. It is necessary to fast for more than six hours before performing electronic bronchoscopy, as well as to complete blood tests and coagulation function tests to avoid endobronchial hemorrhage. If the patient has pulmonary discomfort, it is recommended to actively go to the hospital for a clear diagnosis.