Abstract: Firstly, this paper examines the fundamental principles and significance of cybersecurity protection for power monitoring systems. Secondly, the typical security risks and governance measures of intelligent substation power monitoring systems are summarized, including host security, equipment security, physical environment security, and network architecture security. A comprehensive hazard mitigation strategy management system is established, along with an integrated strategy management platform. Finally, taking a 110 kV intelligent substation in the urban area of Beijing as an example, the effectiveness and accuracy of the strategy management platform are verified, in order to provide reference and guidance for the security governance of power monitoring systems.