Abstract: The morbidity of lung cancer is so high in china, and the prognosis of lung cancer is low.The traditional imaging techniques based on anatomic structure showing show great disadvantages in diagnosis, staging, therapy monitoring and recrudescence identification in patients with lung cancer.As a developer for cellular metabolism, imaging techniques used ¹⁸F-fluoro-deoxyglucose (¹⁸F-FDG) is increasingly being used in clinical now.It can obtain all images from one whole-body scan and it is good for identification of physiological radioactivity or pathological radioactivity.So it is a better choice for identification of lymph node and other organ metastasis, to provide important evidence for clinical staging and treatment planning of lung cancer.