跨境电商出口作为数字经济时代重要的新型贸易方式，为“一带一路”沿线国家的贸易合作注入新动能。中国对沿线国家跨境电商出口坚持高质量、互惠互利的合作，以促进外贸发展。与此同时，“数字丝绸之路”的实施促进沿线国家纷纷发展数字基础设施建设以推动数字经济发展。因此，研究沿线国家数字经济发展对中国跨境电商出口的影响效应对于推动中国跨境电商高质量发展具有重要意义。

本文首先介绍研究背景并通过文献综述系统梳理了数字经济、跨境电商以及数字经济和跨境电商关系的研究，结合已有文献的研究成果，提出了本文的研究目的。其次，本文探究了沿线国家数字经济发展对中国跨境电商出口的影响机理分析，详细阐述了沿线国家数字经济发展对中国跨境电商出口的直接影响效应、间接影响效应和空间溢出效应，提出本文的五个研究假设，并以此作为本文研究基础。再次，本文以“一带一路”沿线国家为研究对象，通过构建多维指标体系并采用改进的熵值法对沿线国家数字经济发展水平进行测算，从指标层面和地区层面进行了对比分析。从次，在测算的基础上，采用2012-2021年沿线57个国家的面板数据构建基准回归模型，探究其直接影响效应，通过中介效应模型和调节效应模型检验其间接影响效应，并通过空间计量模型和空间自相关检验分析其空间效应。最后，根据实证分析，提出中国在与沿线国家的贸易合作中促进中国跨境电商出口的对策建议。

通过分析，得到了以下研究结论：第一、沿线各国的数字经济发展呈现出明显的增长态势，且国别差异显著。第二，沿线国家数字经济发展会明显促进中国跨境电商出口，且数字经济不同维度、不同经济发展水平、所属不同区域的数字经济发展对中国跨境电商出口产生了不同程度的影响。第三，沿线国家数字经济发展会通过降低双边贸易成本促进中国跨境电商出口，还会通过提升本国创新能力促进中国跨境电商出口；沿线制度质量较高的国家其数字经济的发展促进中国跨境电商出口的作用更强。第四，沿线国家数字经济发展和中国对其跨境电商出口存在空间自相关性且具有空间差异性，沿线国家的数字经济发展不仅会促进本国数字经济发展还会对周边数字经济发展具有促进作用，更能促进中国对其跨境电商出口。

As an important new trade mode in the era of digital economy, cross-border e-commerce exports have injected new momentum into trade cooperation among countries along the "Belt and Road Initiative ". China has insisted on high-quality, mutual beneficial cooperation in cross-border e-commerce exports to countries along the border to promote the expansion of foreign trade. At the same time, the realization of the "Digital Silk Road" has facilitated the growth of digital infrastructure in the countries along the route to promote the development of digital economy. Thus, it is of great importance to study the effect of the growth of digital economy on China's cross-border e-commerce exports in the countries along the route to promote the high-quality development of China's cross-border e-commerce.

This thesis firstly introduced the research platform and through literature review systematically sorted out the research on digital economy, cross-border e-commerce, and the connection between digital economy and cross-border e-commerce, presented the research purpose of this thesis by combining the research results of the existing literature. After that, this thesis investigated the impact mechanism analysis of the growth of digital economy on China's cross-border e-commerce exports of the countries along the route, detailed the growth of the digital economy of the countries along the route to China's cross-border e-commerce exports of the direct impact effect, the indirect impact effect and the spatial spillover effect, put forward this thesis's five research hypotheses, and as a basis for this thesis's research. Next, this thesis has taken the countries along the “The Belt and Road Initiative” as the research object, constructed a multi-dimensional indicator system to evaluate the level of digital economy growth of the countries along the route by employing the improved entropy value method, and conducted a comparison and analysis from the indicator level and the region level. Then, on the foundation of the measurement, a panel data of 57 countries along the route from 2012 to 2021 was used to establish a benchmark regression model to explore the direct impact effect, tested the indirect impact effect through the mediation effect model and moderating effect model, analyzed the spatial effects by spatial econometric models and spatial autocorrelation tests. Based on analysis of empirical evidence, the research results were summarized and proposed what measures China should take to boost China's cross-border e-commerce exports in its trade cooperation with the countries along the route.

Through the analysis, the following research conclusions are obtained: firstly, the growth of digital economy development in the coastal countries shows clear growth, and the country differences are remarkable. Secondly, the development of digital economy in the countries along the route will promote China's cross-border e-commerce exports by reducing the cost of bilateral trade, and it will also promote China's cross-border e-commerce exports by upgrading the country's innovation capacity;  different levels of economic development, and belonging to different regions has different degrees of influence on China's cross-border e-commerce exports. And thirdly, the growth of digital economy in the countries along the route influences China's cross-border e-commerce exports through the intermediary effect of lowering trade costs and the intermediary effect of improving the country's innovation capacity; the growth of digital economy in the countries along the route with higher quality of system promotes China's cross-border e-commerce exports in a stronger way. The fourth is that there is spatial autocorrelation and spatial differentiation between the growth of digital economy in the countries along the route and China's cross-border e-commerce exports to them. The growth of digital economy in the countries along the route not only promotes the development of their own digital economy, but also promotes the development of the neighboring digital economy, and better promotes China's cross-border e-commerce exports to them.

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