Abstract: A layered network architecture based on regular hexagonal cells is introduced,and the optimal layers are studied in given monitoring areas.According to theoretical analysis,an optimal layering algorithm is obtained with defined energy model.Simulation analysis is conducted,and the results show that the network life-time can be prolonged effectively with the optimum layers.In addition,the redundant nodes in network are distributed with optimal distribution conditions,enabling the network life-time to ultimately meet the requirements of substation automation system applications.