In order to ensure the stable operation of grid and the electrical safety and economy of user，it is important to establish an effective power quality monitoring system. In allusion to the deficiencies of the existing power quality monitoring system and the problem of interconnection between different monitoring equipment，a regional power quality monitoring system based on the standard of IEC61850 is designed. It really realizes the network management of monitoring system and can timely reflect the every monitoring points as well as the overall level of power quality. On the basis of the introduction of architecture system，basic functions and software design，two key technologies about information modeling for power quality monitoring equipment，sampling value packet capture in the design of the monitoring host and the intelligent evaluation system are expounded in detail. Finally，the feasibility and effectiveness of the system is verified through the application examples.