Abstract: In order to protect the data security of enterprises, state-owned enterprises need to establish a sound network security system, classify and store different information, and set up backup of important data to prevent data loss or hacker attacks. Data security protection not only needs to establish a sound management and technical system, but also needs to build application scenarios combined with industry characteristics. Taking the data security protection of power grid physical assets as an example, this paper discusses the main approach and application practice of using G-AES algorithm to build data security protection system.