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With the development of smart grid and the improvement of intelligence and networking of power terminal equipment, the data communication based on TCP/IP protocol is facing the traditional network security risk. The key part of power grid control is the smart grid unit, which is responsible for the collection and processing of the business data of the power grid, and the receiving and dispatching of the control command and the execution of the data, involving much data transmission. How to ensure the data confidentiality is one of the key factors for the operation of power grid system. In this paper, according to the characteristics of the data and transmission protocol of intelligent unit, through the simulation of intelligent computing environment, on the basis of security requirements, combined with the actual situation of intelligent computing resources, we analysis the power industry and the common national cryptographic algorithm, and evaluate the computing time and stability ,correlation of data length, correlation of key length and working mode of the cryptographic algorithms. Providing theoretical basis and experimental data for the selection of confidentiality protection, especially encryption algorithm for different intelligent units.