Clinically do lung fiberoptic bronchial endoscopy, mainly with the help of other imaging tests, the diagnosis of the disease is not clear enough, or need to use endoscopy to carry out further tests to clarify the diagnosis. If there are occupying lesions in the lungs, CT or even PET-CT can not distinguish the precise nature of the occupying lesions in the lungs, then the lung fiberoptic endoscopy can be done to take the biopsy of the occupying lesions and do the pathological examination to clarify whether the lesions are benign or malignant, so as to provide timely treatment. In addition, for serious lung infections, such as Mycobacterium tuberculosis infection, some foci in the lungs, there are packages and even abscesses, the effect of taking anti-tuberculosis drugs can not be satisfactory, this time, through the bronchial fiberoptic endoscopy, anti-tuberculosis drugs can be injected directly into the abscess in the lungs, and then keep irrigating and injecting the drugs, and regular review, can be more able to kill the foci, thus promoting the recovery of the disease.