Abstract: The application of high proportion new energy, AC/DC ultra-high voltage long-distance transmission, and high proportion power electronics has brought not only new challenges, but also higher requirements for the scheduling and operation management of power communication networks. The power grid and power communication network are typical interdependent networks. Faults of communication network, the highly important nodes in particular, have a serious impact only only on the communication network system itself, but also on its dependent networks, and may lead to cascading failures. Firstly, the challenges of coupling analysis between communication network and power grid business were summarized. Then, an analysis model for judging the impact of communication network fault maintenance on power grid business and a recovery model for the affected business were proposed, and a assisted decision-making platform coupling communication network with power grid for power grid security was developed, thereby realizing the automatic analysis and calculation under N-X and multi-dimensional troubleshooting scenarios. Finally, validation was conducted using a regional backbone transmission network as a practical scenario, achieving the expected results and effectively improving the rapid response capability of communication networks in extreme scenarios.