Abstract: In order to ensure the security and privacy of power user information, this paper proposes a power user information management system based on alliance blockchain technology, which uses the characteristics of alliance chain decentralization and non-tampering to ensure information security. At the same time, in order to improve the operating efficiency of the system, Kafka was used as a consensus mechanism, and the improved 2FA two-factor authentication technology was used to ensure the legitimacy of the login node, and to further enhance the protection of power user information. The system could query and modify user information through the chain code and front-end design. This paper demonstrated the security of the system from three aspects: immutability, privacy and anti-attack ability, and the usability, and the efficiency of this system was proved through tests.