In this paper, by standardizing various purchase, construction, installation, and commissioning engineering data, which is generated by nuclear power plant EPC during engineering construction, equipment installation and commissioning, and establishing relevant standard process to transfer to nuclear power plant owner in production and operation, it resolves core issues of data transfer quality from construction period to operational period for nuclear power project. By means of elaborately analyzing data in construction period which might be used during operation phase, we carry out nuclear power project data handover research from digital perspective, covering transfer scope, transfer principle, transfer strategy, and transfer data specification, etc., and dissect from perspectives of management specification, management platform, and management effect for digital transfer. The research process refers to relevant norms and international standards about process plant at home and abroad, and combines relevant standards and specifications about code of practice for data defined in a digitalized product, we come up with data digital handover standards and specifications based on “Hualong-1” Nuclear Power Project, and start thinking about functionality and technical architecture of digital host platform in the future. Studies have shown that the set of standards, design and construction of the digital platform are applicable to “Hualong-1” nuclear power plant construction, and provide a reference for follow-up similar nuclear power project in the future.