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A B/S (Browser/Server) mode weather modification information management system based on the .NET platform is developed. Subsystems include the basic information management, product release, press release and map release units. The system has the characteristics of: (1) the system is easy to use and has rich contents and friendly interface. (2) the threelevel (provincial, prefecture and county) users can administrate their own weather modification information by using one system and transfer data in real time and synchronously among the three levels. (3) Based on the .NET platform, the web sites have a strong extensibility and good maintainability. (4) Applying the WebGIS technology, weather modification map release can be realized by using ArcIMS. This system is developed by using C++ language and ASP.NET technology. The connection with and access to the database is realized with ADO.NET, and the administration of database is through Microsoft SQL Server 2000. The trial use proved that the system works stably, and can be carried out in high speed easily.