This paper studies that BIM technology applies in large-scale EPC projects to realize integrated management under the general contracting mode of design-purchase-construction integration. It focuses on the characteristics and advantages of the EPC model compared to the traditional management model, and further proposes the EPC improvement mode under the background of BIM technology application. Based on the actual large-scale EPC project of Tongxiang City National Fitness Center, the paper discusses in detail the integrated management of large-scale EPC projects after applying BIM technology, and forms the framework of the EPC improvement model. The case study proves that the integrated application of project BIM under the EPC improvement mode has solved the key and difficult problems of the project and improved the overall benefits of the project.