Abstract: As a metabolic imaging agent,¹⁸F-fluoro-2-deoxy-D-glucose with PET imaging can reflect the function of the cell of normal tissue and carcinoma.It exerts an important role in diagnosing lung masses,differentiating the stage of lung cancer,monitoring response to treatment and assessing for recurrence and prognosis of tumor.It also can provide useful information of the grade and proliferation of lung cancer cell.With respect of the shortcoming of its resolution,¹⁸F-FDG PET should be combined with the examinations of morphology for lesion's localization.