Abstract: The automatic calculation system for pipeline carbon emissions is of great significance for predicting carbon emissions and researching pathways to reduce carbon emissions during the pipeline design process. Aiming at carbon neutrality goals and meeting up with "Building Carbon Emission Calculation Standard," the main pipeline materials and their carbon emission factors are summarized and compiled in this paper. According to the BIM modeling specifications, corresponding calculation standards are specified. Then, based on the data of pipe quantity, specifications, materials, etc., in the Revit model, the carbon emission factor method is adopted, and the functionality of automatically calculating pipeline carbon emissions is implemented through secondary development by using C# + RevitAPI. This system can help designers quickly obtain relatively accurate estimates of pipeline carbon emissions and optimize carbon emissions during the design process. Therefore, the system has broad application prospect and market value.