Tracheoscopy usually refers to bronchoscopy, and bronchoscopy is used to diagnose or treat certain lung diseases, such as lung cancer, airway narrowing, and tuberculosis. It is usually safe and not scary. Bronchoscopes are categorized as rigid or flexible. Hard bronchoscope is a thin hollow tube made of metal, the distal opening is tilted, the edge is smooth and bluntly rounded, easy to insert into the trachea without damaging the mucosa, the proximal end of the handle and the distal tilted opening relative to both the hand-held object and to determine the direction of the opening. Flexible bronchoscopes are mainly fiberoptic bronchoscopes and electronic bronchoscopes. Due to the rigid bronchoscope operation space is larger, easy to stent placement, in this condition can be laser, ablation, freezing and other therapeutic operations, so the application is more common. However, rigid bronchoscopes have higher technical requirements for doctors, require general anesthesia, and the patient is unconscious during the procedure, so the risk of surgery is small. Fiberoptic bronchoscopy is easy to operate and patients with little pain, widely used in clinical practice. Electronic bronchoscopy can through the high-definition monitor image, make the image more clear, can effectively avoid the surrounding normal tissue damage. Bronchoscopy is not scary, the technology has been more mature, it is recommended to be operated by professional doctors in regular hospitals.