As the focus of the natural process of carbon emissions data content information management system construction, the natural process of carbon emissions research data WebGIS system construction has become the object of study. The WebGIS system uses Silverlight as the client platform and uses the ArcGIS Server as the system GIS Server. It is combined with WCF RIA Service, ArcGIS API for Silverlight and other WebGIS technologies. We designed the system frame structure and the spatial database and gave out the spatial data and non-spatial data organization and its web access strategy. It achieved the non-spatial data network dynamic query, retrieval, statistics and analysis. It has functions of displaying the spatial data web maps, analyzing spatial data and making the matic map, etc. In the process of system building, we focused on the analysis of key technologies, involved WebGIS and the specific implementation of solutions. Studies had shown that building a WebGIS system based on the Silverlight technology and ArcGIS Server platform, not only can solve the release and management of geospatial data, develop the system function fast and efficiently, but also can meet the requirements of high interactivity and response time, and improve the performance of WebGIS system.