Abstract: In substation communication room, all kinds of communication equipment keep running 24 hour a day. These equipment provide reliable transmission channel for relay protection and security automatic devices and they are foundation of the power system safe and stable operation. In order to reduce the energy consumption of communication room, the main power consumption of communication equipments in room is analyzed. Based on extensive research, combined with practical engineering, an energy conservation scheme based on PUE (Power Usage Effectiveness) substation communication room is proposed. This scheme is applicability and practicable. The effectiveness of the scheme is verified by a practical example of substation communication room.