Most of the lung cancers can be clearly diagnosed by bronchoscopy, and the doctor will make the initial judgment based on the patient’s imaging data. Bronchoscopy is an important examination tool for the diagnosis of lung disorders. Most of the lung occupying lesions, such as central lung cancer, can be diagnosed clearly by obtaining pathological tissues through bronchoscopy. However, if the lung lesion is located in the periphery or mediastinum, or if the lesion is in external pressure, it is difficult to obtain effective tissues under bronchoscopy, thus the nature of the lesion cannot be clarified. Lesions that cannot be clarified by bronchoscopy need to be combined with thoracoscopy, mediastinoscopy, and percutaneous lung aspiration biopsy to further assist in the diagnosis. Note: Bronchoscopy is an invasive operation, it is recommended that regular hospitals for consultation, the need to improve the relevant preoperative examination to check the contraindications of bronchial, such as oral hydroclopidogrel, warfarin and other anticoagulant medications, need to be discontinued for 5-7 days prior to bronchoscopy, the specific instructions of the doctor shall prevail.