This paper focuses on the Web Geographic Information System (WebGIS) for atmospheric equipment monitoring based on ArcGIS Server technique. MVC design pattern based on JSF and ArcGIS Server techniques was implemented in the system (i.e. Atmospheric Equipment Monitoring System) which combined with WebGIS key technology. Atmospheric Equipment Monitoring System was divided into four layers, i.e. client layer, web layer, WebGIS application service layer and database layer. Web layer includes view, controller and non-spatial business logic, mainly implementing the user interface in the four layers. WebGIS application service layer, which contained the business logic, was accomplished by invoking the ArcObjects on GIS server and the Application Program Interface (API) of ArcGIS Server, and JavaBeans with spatial data processing functions were also used in this layer. Spatial data was managed and stored by ArcGIS SDE 9.3 and Oracle 10g, which was accessed by means of service objects' calling from WebGIS application service layer. The key technologies such as Asynchronous JavaScript and XML (Ajax), dynamic change of vector data and raster data were used in the information system. The Atmospheric Equipment Monitoring System consisted of equipment operation status monitoring, meteorological element mapping, abnormal weather monitoring, extreme value monitoring, data quality assessment and comprehensive information display. Users can monitor the operation status of meteorological equipment by the system, which is useful for making decision. At the same time, it would contribute to weather process analysis, early detection of abnormal weather phenomena, would enhance analysis and decision-making capacity for disaster prevention in China.