Carbon emissions in the process in oil and gas development is an important part of the natural process of carbon emissions and building carbon system based on space information system contributes to the realization of real-time carbon emissions data query, update, analysis and sharing, the system uses B/S design pattern, integration of geographic information technology and distributed processing technology, based on the silverlight for distributed system architecture, realizes space information system development and design, at the same time the measurement algorithm is introduced, a calculation is made of carbon emissions for oil and gas development, analysis, the analysis result is expressed in the form of the annual report of income and expenses, and provides effective data for carbon reduction decision support.