## 6 Conclusions  
In the context of new productivity driving high-quality development across various industries in China, exploring the interactive mechanisms and synergistic effects between regional green technology innovation and carbon reduction in the construction industry is crucial for promoting the green, low-carbon transformation and sustainable development of the construction sector. This study is based on panel data from 30 provinces and municipalities in China from 2013 to 2021, and empirically analyzed the synergistic evolutionary relationship between regional green technology innovation and carbon reduction in the construction industry from the perspective of new productivity. Our results revealed the interactive relationships among the three, the spatial-temporal distribution dynamics, and their differentiated characteristics. The results show that RGTI not only directly promotes CRCI but also reduces carbon emissions intensity in the construction industry by enhancing NQP, thereby fostering carbon reduction in the construction sector and creating a \"dual-driving effect\". Furthermore, the levels of coordinated development among RGTI, NQP, and CRCI are continuously improving, yet significant regional heterogeneities exist, with an overall decreasing trend from the eastern to central and western regions. Specifically, the eastern region leverages policy advantages, economic levels, structural adjustments in industry, and resource siphoning benefits to achieve a benign, coordinated interaction between green technology innovation and carbon reduction. In contrast, the central, western, and northeastern regions are constrained by their development stages and resource limitations, exhibiting regional phenomena of \"carbon lock-in\" and \"polarization\". This imbalance in regional development further highlights the challenges faced in advancing new productivity in China, particularly in the process of promoting a green, low-carbon transition. Based on this, under the impetus of new productivity, the green, low-carbon transformation of the construction industry requires the establishment of a more refined and inclusive regional collaborative development mechanism. Adaptive green technology innovation pathways can be designed based on the differentiated characteristics of different provinces, such as urbanization rates and industry maturity. For example, in the eastern region, which has a high urbanization rate and relatively mature industrial structure, it is essential to promote public-private partnerships and accelerate the deep application of green technologies throughout the entire lifecycle of construction through innovative local governance models. In contrast, for the central and western regions, emphasis should be placed on improving infrastructure development and the cultivation of green technology talent, gradually alleviating the structural imbalance in regional innovation capabilities through special fund support. At the same time, a cross-regional technology diffusion platform should be established to facilitate the orderly flow of innovation resources from the eastern region to other areas. Additionally, a precise carbon emissions monitoring and dynamic assessment system should be established. Through participation from multiple stakeholders and a regionally tailored innovation ecosystem, this approach can not only stimulate regional innovation vitality but also effectively break through the \"carbon lock-in\" dilemma, ultimately achieving a holistic breakthrough and high-quality development in the green, low-carbon transformation of the construction industry. Finally, this study constructed, for the first time, a multi-dimensional interaction framework of new productivity, regional green technology innovation, and carbon reduction in the construction industry based on the concept of coupled synergy. By incorporating new productivity into the study of carbon reduction in the construction industry, we expanded and extended the boundaries of previous research in this field.