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Owing to the constant modernization and urbanization of China, most cities have subways, and the total power consumption of subway stations has been rising, which contradicts with China’s green goals. In this regard, energy consumption indicators for major energy use projects in subway stations should be established, comprehensive evaluation and detailed research on the current situation of subway operation should be conducted, and specific energy-saving measures should be taken from a diversified perspective. It is crucial to systematically sort out the principle of sub-item energy consumption in subway stations, and practice and explore the specific simplification measures of the principle model of sub-item energy consumption, so as to lay a solid foundation for achieving the goal of reducing energy consumption of subway stations.

Urban subways have developed rapidly in recent years and has gradually become the primary choice of public transportation in big cities. Subways can effectively alleviate urban traffic congestion and improve passengers’ green travel experience, especially in the old urban areas where urban space is limited, community facilities are aging and historical features are gathered. Subways play a huge role in guiding the expansion of urban space form and improving urban landscape environment. As the only channel for passengers to get in and out of the station, the subway entrance and exit act as a bridge. It is not only the transition space between the subway station space and the urban above ground space, but also an important node for the exchange and circulation of various elements in the urban space. In this paper, the influencing factors of subway entrance and exit space environments in the old city were investigated, and relevant basis for future planning, design, and construction of subway entrances and exits were provided. Firstly, the research results and shortcomings of subway entrance and exit channels were outlined. Secondly, based on the perspective of residents and passengers, this paper uses the analytic hierarchy process to determine six first-class evaluation indexes, including safety, convenience, practicability and aesthetics. This paper constructs the evaluation system of spatial environment index of subway station entrances and exits in the old urban area of Xi’an. Lastly, according to the evaluation results, the paper puts forward the targeted optimization strategies for the current situation of the entrance and exit space environment of the subway stations in the Xi’an.