In order to govern unbalancing and distorting voltages in network and suppress the influences of nonlinear loads， a coordinated control strategy based on ABC rest frame for three-phase four-wire unified power quality conditioner（UPQC） is introduced. By controlling the series converter as a fundamental sine current source and the parallel converter as a fundamental sine voltage source， the proposed control strategy can make the UPQC carries out all of the control terms: the sinusoidal input current， the unit input power factor， the sinusoidal and balanced output voltage with normal value to improve power qualities at the side of networks and at the side of loads. The experimental results of 10 kVA prototype verify that the strategy is feasible.