A lightning parameter inquiry system is designed and implemented using MapX5.0,Microsoft SQL Server 2008 and C# programming language under. NET4.0 development environment.Combined lightning data with geographic information,this system can realize functions of query and editing of geographic information,storage and management of original lightning data,query and analysis of lightning parameters,and drawing and output of thematic maps.For instance,this paper takes the Wuhan city circle,which includes 9 cities of Wuhan,Xiaogan,Tianmen,Qianjiang,Xiantao,Xianning,Ezhou,Huangshi and Huanggang,to implement this GIS based inquiry system,and shows the results of lightning parameter inquiry,thematic map drawing,position of lightning occurrence and observation station,and distribution of lightning current intensity.