Abstract: The construction of energy Internet promotes the efficient interconnection of massive terminals and provides a strong support for the efficient interaction of energy flow and information flow. However, it also made the boundary of power information network more and more obscure. The rapid expansion of the system scale may result in more frequent data interaction, more complex system operating environment, as well as higher security requirements for operational data interaction. This paper studies the application of Chinese cipher, quantum key distribution and blockchain technology in the core operational scenarios of power information network, towards to build a new generation of power data security protection model. The analysis results show that the proposed method can meet the development requirements of the power information network and make up for the security deficiencies in the power data interaction process under the zero-trust environment, which can further improve the security protection of the operation data of the power system.