Disclosed are a power automation system using a TRS network and a control method thereof which can reduce the power failure time and power failure areas when an obstacle is raised by providing a pure radio transmission path using a TRS network, in which base transceiver subsystems mostly stand on an eminence and a high output service can be provided, between a control center computer and power equipment so that the remote control center computer can promptly control the power equipment and the obstacle raised in the power equipment. The power automation system using the TRS network includes a power automation control center computer for performing a remote control and measurement of a remote terminal unit (RTU), a radio communication unit, connected to the control center computer, for outputting a radio communication signal to the outside, a TRS base transceiver subsystem for repeating a radio signal so that it can receive and transmit the radio signal outputted from the radio communication unit using the TRS network, and a power equipment connected by wireless to the TRS base transceiver subsystem.