Abstract： Objective Using Meta analysis to evaluate the value of ~(18)F-FDG PET/CT(~(18)fluorinefluorodeoxyglucose Positron emission tomography/computed tomography)in differentiating between benign and malignant pulmonary lesions.Methods Relevant documentations from PubMed and other 5 databases from 1980 to 2008 were searched,and the eligible literatures according to the inclusive criteria were selected.The statistical information and quality of science were assessed and classified.The data were analyzed using Meta-Discl.4 software.The diagnostic value of PET/CT in distinguishing benign from malignant pulmonary lesions was evaluated by the pooled sensitivity,specificity,the likelihood ratio(LR) and summary receiver operating characteristic curve(SROC curve)statistical indicators.Results Seven literatures were collected including 5 in English and 2 in Chinese,and 795 cases were included in the study.Heterogeneity test showed that the homogeneity of the study was good.By using deterministic models to analyze the data,the value of the weighted sensitivity was,95%(93%～97%),the specificity Was 77% (71%～82%),the positive likelihood ratio Was 4.12,negative Iikelihood ratio was 0.08,and the SROC area under the curve(area under curve,AUC)was 94%.Conclusion PET/CT is of high diagnostic value in differentiation between benign and malignant lung lesions,but large sized,multicenter,prospective studies are needed to assess its clinical value more accurately.