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The geomagnetically-induced currents (GIC) on the power grid results from changes of geomagnetic field caused by solar activity, which is the significant problem and needs to be monitored to provide data for disaster analysis. In this paper, we combine with computer networks and communication technologies; develop the Web-based monitoring system for geomagnetically-induced current. The system's background uses the .NET and Web technology, and uses GPRS technology to remote data transmission. It also combined with local monitoring device to monitor GIC from a neutral point of transformer. The test and application of monitoring system shows that the system can in effect monitor the grid GIC data, and has advantages of interactive and operational.