Abstract: The paper introduced an intelligent monitoring, analysis and management system of power quality, and focused on overall structure, software architecture and function modules of the system. The system can online monitor electricity consumption situation and power quality of substation real-timely, classify and process collected information automatically, and achieve functions of online and association analysis of power quality and emergency alarm, which provides a reference for power grid plan, power quality trend forecasting, event prediction, pollution control and resolution of power quality disputes.