Objective:To explore the calculation method for benefits of economy and society, and analyze and evaluate the performance of large medical imaging equipment.Methods: The data of magnetic resonance imaging (MRI), computed tomography (CT) and digital radiography (DR) during 2014-2016 were analyzed and the used frequency of equipment in research and teaching task was adopted to evaluate their social benefit. Accounting of single machine method and return on investment method were applied to calculate economic benefit. Finally, the benefit of large medical equipment was comprehensively and systematically evaluated.Results:The benefits of CT and MRI were good, and their overall benefit got steadily growth. While the overall benefit of DR was decline, even individual benefit of DR was loss. For these equipments whose benefits were not ideal, their disadvantages in purchasing, using and management process has been analyzed, and the continuous improvement and suggestion has been provided.Conclusion: Social benefits is an important part of the performance of large medical equipment used in research and teaching. The comprehensive assessment that economic benefits combines with social benefits has great significant for the cost-benefit analysis of large medical equipment.