Power quality monitoring data’s transmission, based on 230 MHz wireless network, due to multipath effects,will result intersymbol interference,severely restricting quality of data transmission, producing energy efficiency evaluation system’s error．In this paper,an equalizer,based on RLS (recursive least squares) adaptive filter, was put forward to be added in the digital radio．RLS weight control mechanism,with faster convergence speed,meet the requirements of real-time communication ,and it can effectively reduce the error caused by intersymbol interference. As a result, the communication reliability is improved．The simulation result shows that this method can effectively reduce the error rate during power quality monitoring data’s transmission in the energy efficiency evaluation system, it has broad prospects of application．