Lung cancer is classified into central lung cancer and peripheral lung cancer according to anatomical classification. CT, as an important imaging test, can clinically determine whether lung cancer is caused by bronchi above or below the segment, but pathological examination is needed to confirm the diagnosis. CT is an important imaging tool to clinically determine whether lung cancer is caused by bronchus above or below the segment, but pathological examination is needed to confirm the diagnosis. Therefore, CT is an important test for lung cancer and can determine whether the lung cancer is peripheral or central lung cancer. If peripheral lung cancer is detected early without active treatment, it can metastasize to the hilar lymph nodes. Therefore, CT of central type lung cancer and peripheral type lung cancer can detect and suggest the diagnosis at an early stage in order to advise the clinic whether to give tracheoscopy or puncture biopsy to further clarify the diagnosis.