Bronchial biopsy is one of the methods to diagnose respiratory diseases by inserting the bronchoscope into the trachea, bronchial tubes and their branches, and obtaining the diseased tissues for pathological examination. Bronchoscope is easy to insert into the trachea, bronchus and its branches because of its fine diameter and bendability. If lesion tissue is found, it can be taken out and sent for pathological examination, which can help to clarify the diagnosis of the disease, for example, it can determine whether the growing tumor is malignant or benign tumor and so on. It has important guiding significance for the diagnosis of respiratory diseases. In general, when patients are found to have diffuse lesions, isolated nodules or masses of unknown nature, tissues need to be clamped or needle aspirated for pathology or cytology, and the subject needs to be fasted for at least 4 hours before the operation. If bronchial related disease occurs, please go to the hospital in time for relevant examination to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.