为探究城市空间集约和土地高效利用背景下城市中心区地下公共空间与轨道交通一体化发展的低碳效应，梳理城市中心区地下公共空间与轨道交通一体化发展在构成要素、开发生命周期等方面的特征，分析一体化策划、规划、设计、建造和运维等发展阶段对促进“双碳”目标实现的作用与意义； 构建基于“双碳”目标的包含城市轨道交通发展、城市发展、一体化的低碳效应、城市中心区发展和城市中心区开发5项准则层指标在内的22项指标的一体化测度指标体系，综合运用层次分析法和模糊综合评价法构建城市中心区地下公共空间与轨道交通一体化发展评价方法体系。以南京新街口中心区2005年、2010年、2014年和2019年4个典〖JP2〗型阶段为例进行评价，结果分别为2.349、3.105、3.588和4.222，对应的一体化发展水平分别为较差、中、良和良。对照南京新街口中心区渐进式一体化发展历程可知，南京新街口中心区地下公共空间与轨道交通一体化发展对促进区域“双碳”目标实现作用显著。

To investigate the lowcarbon effect of the integrated development of underground public spaces and rail transit in urban centers under urban space intensification and efficient land use, the characteristics of the integrated development of underground public spaces and rail transit in urban centers are summarized in terms of components and development lifecycles. Then, the role and significance of integrated planning, design, construction, operation, and maintenance in realizing the Carbon Peaking and Neutralization Policy are analyzed. Then, an integrated measurement index system with 22 indices, including five criterionlevel indicators, such as urban rail transit development, urban development, the lowcarbon effect of integration, and urban central area development, is constructed based on the Carbon Peaking and Neutralization Policy. The analytic hierarchy process and the fuzzy comprehensive evaluation method are comprehensively employed to construct an evaluation method for the integrated development of underground public spaces and rail transit in central urban areas. Finally, case studies are conducted on four typical stages in 2005, 2010, 2014, and 2019 of Nanjing Xinjiekou central district, and the evaluation results are 2.349, 3.105, 3.588, and 4.222, respectively, corresponding to bad, not bad, good, and good integration development levels. According to the progressive integration development process of Nanjing Xinjiekou central area, the integrated development of the underground public spaces and rail transit in Nanjing Xinjiekou central area is critical in realizing the regional Carbon Peaking and Neutralization Policy.