This paper designed the power quality remote monitoring system based on FPGA. The system useshardware phase-locked frequency tracking technology for Synchronous sampling of the three-phase voltage，current，reducing leakage and spectral interference between spectrums. This system uses FPGA＇s FFT IP core to complete256 points of the harmonic operation and uses SOPC and Nios II soft-core embedded processor to read data collectedand harmonic operation results，combining with Marvell88E1111 network chip to transmit data to the hostcomputer. The host computer process and data further，thus achieving power quality parameters for remotemonitoring purposes.