The purpose of this design is to use the Unity3D engine to build a comprehensive digital twin system to support the decision-making and implementation processes of enterprises in reducing carbon emissions. By integrating key functions such as dual carbon emission reduction, data monitoring, carbon emission trading software and carbon reduction policy navigation, it provides enterprises with a wide range of introduction and support for emission reduction measures. The system will use the Unity3D engine to build a digital twin model of the enterprise to accurately simulate the carbon emissions of the enterprise's physical facilities and production processes. The system provides powerful data monitoring functions to collect and analyze key information such as energy consumption and emission data of enterprises. Through visual charts and reports, enterprises and governments can intuitively understand energy use and double carbon emissions. In addition, the system will integrate carbon emissions trading software to provide companies with the ability to participate in the carbon trading market. At the same time, it provides the navigation function of carbon reduction policy, timely updates and conveys relevant emission reduction policies and regulations, and understands the latest emission reduction policy requirements. Through the combination of these functions, enterprises and governments can fully understand and manage their carbon emissions, formulate effective emission reduction strategies, and achieve carbon emission reduction goals, and make positive contributions to sustainable development.