The collaborative and low-cost nature of wireless sensor networks (WSNs) brings significant advantages over traditional communication technologies used in today’s electric power systems., how to device status data with secure, cost-effectively sent to the monitoring center for analysis, is an important topic in the field. In this paper, firstly finds the several key characteristics of wireless sensor networks communication link; then analyzing relations between RSSI and receives package ratio. The main idea is obtaining the RSSI value through forward link and reverse link then calculate the success to send a packet which need the minimum energy. From these, the REEOA route metric algorithm is provided. Algorithm is applied to intelligent online monitoring system, Experiments show that the wireless sensor network for intelligent substation on-line monitoring system to provide valuable reference.