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Focused on the key problems of lightning monitoring and forecasting, a system of lightning monitoring, forecasting, and data dealing is devised with a threelayer logical structure based on the platform of ArcEngine, under the support of SqlServer 2005 and GeoDatabase. This system steps beyond the data boundary of GIS and lightning domain, and integrates the lightning forecasting model, realizing the monitoring and early warning of lightning in realtime based on GIS. Meanwhile, the system achieves efficient organization, storage and management of the relevant heterogeneous lightning data including geoinformation, and satisfies demands like history lightning data query, processing， and analysis. It provides an effective visual platform for meteorological departments concerning lightning weather monitoring, forecasting and early warning, as well as the comprehensive lightning data processing and analysis based on GIS. It also makes a valuable exploration in combining GIS with meteorological service.