PET-CT examination can check the severity of lung cancer and is also an important way to assess clinical staging. Lung cancer is a common malignant tumor, which is prone to metastasis due to the richer blood supply and lymphatic system. PET-CT examination can evaluate the lesions in the whole body, which is of great clinical value for the evaluation of clinical staging and diagnosis of lung cancer. If the lesion can be completely resected by PET-CT and there is no obvious lymph node metastasis or distant metastasis, surgery should be chosen actively, and this kind of patients will benefit most from surgery. For those who already have multiple lymph node metastases that cannot be completely removed by surgery, or those who have distant metastases, surgery is not recommended because the probability of recurrent metastases after surgery is very high, and surgery is not beneficial.