Abstract: To solve the shortcomings of bad anti-interference ability and low reliability of present reactive power compensator,the paper proposed a design scheme of intelligent reactive power com-(pensator.) It introduced design of hardware and software and working principle of the compensator,and gave realized functions and adopted anti-interference measures of the compensator.The compensator made an industrial test at No.1 and No.2 motor of pump house of the explosive materials limited company of Pingdingshan coal group,and the result showed that the compensator has stable running,reliable and sensitive action and accurate display,which effectively improves power factor of electrical equipment.