The project has studied and designed a monitoring and management system for power quality. The designed system adopts the new architecture based on DSP+PC. Through researching the newly national power quality standard and analytic method for power quality, the relevant power quality algorithms containing FFT, wavelet transformation and IEC are simulated by the tool of MATLAB. The hardware platform takes the DSP of TMS320F2812 as core, besides, the technology of hardware PLL greatly reduces the spectrum leakage and fence effect.The monitoring terminal program is completed with development environment CCS3.3. The monitoring center interface is developed with Visual Basic, and receives communication data from the terminal unit through RS232 based on Modbus communication protocol.After debugging and experiment, the designed system is stable and reliable . The system runs well and the project has reached the expected design aims.