Abstract: Due to the particularity of power industry, the reliability of power communication network carrying its business transmission has been paid more and more attention. With the continuous improvement of the communication network structrue,the network gradually presents the characteristics of vertical layering, which makes cross-layer joint protection possible. A crosslayer protection based on network coding（CLPBNC） strategy is proposed for power communication network. In IP layer, network coding is used to protect links. In optical transmission network, preconfigured cycle（P-cycle） is used to recover link failure. And conditions of cross-layer joint protection are studied to improve protection efficiency. The simulation results show that CLPBNC can effectively reduce the redundancy of protection, improve the efficiency of protection and optimize the overall performance of the network.