凭借劳动力、原材料和土地等生产要素带来的低成本优势，制造业为中国经济增长和综合国力提升做出巨大贡献。随着全球产业格局的深刻变化，我国制造业面临着创新能力不足、低端锁定等问题的考验，亟需寻找发展新动能。与此同时，大数据、物联网等新一代信息技术表现出强大的发展潜力，成为我国制造业升级的关键因素。基于以上背景，本文对数字经济赋能制造业结构升级进行理论分析和实证研究，以期为我国制造业转型升级提供决策参考依据。

       本文首先对数字经济赋能制造业结构升级的作用机理进行系统分析；其次，运用熵值法测度我国2012-2021年30个省市的数字经济和制造业结构升级水平；再次，运用固定效应模型、中介效应模型和门槛效应模型进行实证分析；最后，基于理论与实证分析提出数字经济赋能制造业结构升级的提升路径。

      研究结果表明：（1）我国数字经济呈现东部地区最佳、中部次之、西部最差的排序情况；制造业结构升级水平也呈现出东高西低的不均衡分布状况。（2）从直接效应模型来看，全国层面，数字经济显著提升制造业结构升级水平；区域层面，数字经济显著提升东部地区制造业结构升级水平，西部地区促进作用次之，而对中部地区无显著影响。（3）从中介效应模型来看，全国层面，数字经济通过技术创新、人力资本、市场化程度和环境规制影响制造业结构升级；区域层面，东部地区人力资本和环境规制起到显著中介作用，中部地区无明显中介效应，西部地区数字经济通过技术创新和市场化程度影响制造业结构升级。（4）从门槛效应模型来看，数字经济对制造业结构升级存在“边际效应递增”规律。进一步研究发现，以技术创新、人力资本和市场化程度为门槛时，数字经济对制造业结构升级存在“边际效应递增”规律；以环境规制为门槛，数字经济对制造业结构升级存在“边际效应递减”规律。（5）本文从加强数字经济发展顶层设计和总体布局、以创新为核心动力、健全人才培养机制、激发要素市场活力和完善环境规制政策五个方面探讨数字经济赋能制造业结构升级的提升路径。

     With the low-cost advantage brought about by production factors such as labor, raw materials, and land, the manufacturing industry has made great contributions to China's economic growth and the enhancement of its comprehensive national strength. With the profound changes in the global industrial pattern, China's manufacturing industry is facing the test of insufficient innovation capacity, low-end lock-in, and other problems, and there is an urgent need to find new momentum for development. At the same time, new-generation information technologies such as big data and the Internet of Things have demonstrated strong development potential and become key factors in the upgrading of China's manufacturing industry. Based on the above background, this paper carries out theoretical analysis and empirical research on digital economy-empowered manufacturing structure upgrading, to provide a decision-making reference basis for the transformation and upgrading of China's manufacturing industry.

    This paper firstly analyzes the systematic mechanism of digital economy empowering manufacturing structure upgrading; secondly, uses the entropy method to measure the level of digital economy and manufacturing structure upgrading of 30 provinces and municipalities in China from 2012 to 2021; thirdly, empirically analyzes it by using the fixed effect model, the mediation effect model, and the threshold effect model; and lastly, based on the theoretical and empirical analyses, puts forward the upgrading path of digital economy empowering manufacturing structure upgrading.

    The results of the study show that: (1) China's digital economy presents the best ranking situation in the eastern region, the second in the central region, and the worst in the western region; the level of upgrading of the manufacturing structure also presents an unbalanced distribution of high in the east and low in the west. (2) From the direct effect model, at the national level, the digital economy significantly improves the level of manufacturing structure upgrading; at the regional level, the digital economy significantly improves the level of manufacturing structure upgrading in the eastern region, followed by the western region, and has no significant effect on the central region. (3) From the mediation effect model, at the national level, the digital economy affects manufacturing structure upgrading through technological innovation, human capital, marketization degree, and environmental regulation; at the regional level, human capital and environmental regulation play a significant mediating role in the eastern region, there is no significant mediating effect in the central region, and the digital economy affects manufacturing structure upgrading in the western region through technological innovation and marketization degree. (4) From the perspective of the threshold effect model, there is a law of the "increasing marginal effect" of the digital economy on the structural upgrading of the manufacturing industry. Further research found that, with technological innovation, human capital, and the degree of marketization as the threshold, the digital economy on the structural upgrading of the manufacturing industry, there is a "marginal effect increasing" law; with the environmental regulation as the threshold, the digital economy on the structural upgrading of the manufacturing industry, there is a "diminishing marginal effect" law. The law of "diminishing marginal effect" exists in the upgrading of manufacturing structure with environmental regulation as the threshold. (5) This paper discusses the upgrading path of the digital economy empowering the structural upgrading of the manufacturing industry in five aspects: strengthening the top-level design and overall layout of the digital economy development, taking innovation as the core driving force, perfecting the mechanism of talent cultivation, stimulating the vitality of the factor market, and perfecting the environmental regulation policy.

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