Tracheoscopy is mainly used for the examination of central type lung cancer, and the accuracy rate of tracheoscopy for central type lung cancer is more than 90%. Lung cancer is divided into central type lung cancer and peripheral type lung cancer, and the main ways to check lung cancer are imaging examination, electronic bronchoscopy, puncture biopsy examination and so on. Bronchoscopy is mainly used for the examination of central type lung cancer, which means that the tumor is located in the bronchus above the lung segment, etc. The positive rate and accuracy rate of the examination of central type lung cancer can be more than 90%. Through the examination of bronchoscopy, the growth site of the tumor, the invasion range of the tumor, the distance between the tumor and the bronchiolar eminence can be clarified, while the histopathology of the tumor can be obtained, and the diagnosis can be further clarified through histopathological examination. Peripheral lung cancer is usually in the bronchial tubes below the bronchial openings of lung segments, which are difficult to be reached by bronchoscopy, and it is necessary to rely on CT-guided puncture biopsy to diagnose lung cancer. If patients have been diagnosed with central lung cancer through bronchoscopy, they should go to regular hospitals in time for consultation and active treatment under the guidance of professional doctors.