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The operational system for thunder/lightning potential forecasting based on similar deviation is established by using VB and VC programming languages and MS SQL Server Database， on the basis of the thunder/lightning observation data of Ningxia and the forecasting products of ECMWF and T213. This operational system can give a similar discrimination of physical factors based on the objectively analogue circulation and affecting system automatic recognition. It can produce the forecasting results of circulation patterns and physical quantities in the coming 168 hours， in which the first 10/20 cases with minimum similar deviation were used as the “blueprint” for forecasting; and the system can also accomplish the making and distribution of thunder/lightning potential forecasting products by humanmachine interaction， which enhances the objectivity and automation of the thunder/lightning potential forecasting system. Moreover， it has the functions of thunder/lightning data querying， calculating， outputting， saving， loading， displaying， and so on. This system has become the main operational platform for the making and distribution of thunder/lightning potential forecasting in Ningxia.