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With the increasing application of intelligent terminal and the increasing demand for its functions, it is necessary to remotely upgrade IAP for embedded software. Aiming at the security of remote online upgrade of voltage monitoring terminal, the previous upgrade only considered the upgrade function, but neglected the efficiency and security of the upgrade, which made the upgrade software easy to be stolen by the third party. This paper proposed an online upgrade encryption communication method, through the framework of voltage monitoring system, communication protocol, files. The structure and encryption method are analyzed and studied. The methods of discontinuous transmission, Fibonacci matrix and Diffie-Hellman key exchange are used to ensure the efficiency of upgrade operation, and to achieve security and fault-tolerance. The practice results show that the upgraded encryption.