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This paper studies energy saving of PRMCS (pharos remote monitoring and control system) based on WSN (wireless sensor networks). RTU (remote terminal unit), sensor networks of PRMCS, are installed in outdoor fieldwork, and limited in power, PRMCS saving energy become a key problem. We develop a low power consumption method for PRMCS in which LEACH route algorithm and Sleep-Waken model dispatch are designed to reduce power consumption. Test results indicate that for RTU and sensor networks, our solution method can save over 170% energy compared with traditional method.