Abstract: Aiming at the unbalanced occupation of optical layer link resources in optical transport network（OTN） communication network routing planning for power system protection, a routing equilibrium planning method of OTN communication network for power system protection is proposed. First, the structure and business requirements of the communication network of power system protection are elaborated. Then, based on building the hierarchical model of the OTN communication network for power system protection, the electrical and optical layer indices are quantified as constraints, and the optimal planning model for the routing equilibrium including transmission delay, service reliability, electrical layer resource occupancy rate, optical layer resource occupancy rate and the method for solving the model are proposed. Finally, the effectiveness of the planning method is verified through experiments. Simulation results show that the planning method can avoid the appearance of high-load links and nodes of optical layer, and reduce the standard deviation of link occupancy rate of the optical layer.