Abstract: The construction management of large-scale hydropower project is complex.There are lots of construction data in the construction period and these data is difficult to manage.Therefore,a “1+1+N” digital construction management mode was proposed,which was based on BIM,Big Data,Internet of Things,Cloud Computing and other advanced technologies.Combined with the actual characteristics of DG hydropower project,the “1+1+N” mode was applied for its construction management.The application results showed that this mode greatly simplified the data management difficulty during the construction period,which solved the “data island” problem.Besides,this mode effectively improved the construction management efficiency and level.The “1+1+N” mode realized the fine construction management.It also provided a good reference for the innovation and improvement of large-scale hydropower project construction management.