Abstract: Energy subway station is a new type of energy underground structure that takes advantage of geothermal energy to control the temperature of subway station.In this paper, the energy metro station is selected as the research object, the construction process is divided into sections based on the construction characteristics, and the carbon emission calculation method of the embodied stage of the energy subway station considering the construction of the ground source heat pump salt water pipe system is established based on the emission factor method.Taking a subway station in Beijing as an example, the carbon emissions in the embodied stage after adding ground source heat pump brine pipe system to the subway station were calculated, and finally the results were analyzed and verified.At present, there is still a lack of detailed calculation method for carbon emissions of underground structures, the establishment of which can not only provide theoretical and calculation reference for similar engineering carbon emission accounting work, but also meet the development needs of infrastructure construction industry, which is of great significance to promote the establishment and improvement of China's carbon emission accounting system.