Intelligent analysis system of a case base for disastrous weather includes three parts: basic data support subsystem (data layer), meteorological data application middleware subsystem (service layer) and integrated analysis service of case base subsystem (application layer). It can achieve the interactive input of meteorological disaster weather, query and retrieval of keywords, intelligent analysis of related meteorological data and other functions by comprehensively using various technologies in HTML5 Canvas, database, GIS, efficient visual rendering, etc. This paper mainly discusses the key technologies in the system architecture, design of case library and functional features, and instructs in detail the design and implementation of the functions such as data entry and query, WebGIS components, visual rendering, and reanalysis of meteorological data. The result operation application shows that the Web page responds quickly and has a good performance in compatible with browser and good humancomputer interaction experience. It can meet the needs of high efficiency, intelligence and flexibility, playing an important role in the establishment of the correct forecast ideas and the ability to improve in the analysis of the weather process.