伴随数字技术的持续进步，世界数字化发展趋势日益明显，数字贸易正成为国际贸易的重要组成部分。本文通过分析研究数字贸易的发展现状和我国跨境电商的出口情况，依据前人研究中提出的数字贸易的概念框架以及与数字贸易相关的统计指标，从数字基础设施建设、数字贸易环境以及 ICT 产品贸易三个维度选取八个二级指标建立数字贸易发展水平指标体系。基于这一体系，本研究采用主成分分析法对选取的 22 个贸易伙伴国 2012 年至 2022年的数字贸易发展水平的综合指数进行测算和分析，评估比较各国在数字贸易方面的发展情况。测算结果表明，在测算覆盖的时间内，各国的数字贸易发展水平普遍呈现上升趋势；高收入水平的国家的数字贸易发展水平整体上高于低收入水平的国家，这一差距没有随着时间的变化而被消减。

随后，本研究运用拓展的贸易引力模型对进口国的数字贸易发展水平对中国跨境电商出口的影响进行实证研究，并通过替换数字贸易发展指数测算方法和核心变量滞后一期两种方法对实证结果进行稳健性检验。研究结果显示，数字贸易发展水平对中国跨境电商出口具有显著的正向影响。基于研究结果，本文从数字基础设施建设、数字贸易环境以及 ICT 产业发展三个角度为中国跨境电商出口提出了建议。

With the continuous advancement of digital technology, the global trend of digitization is becoming increasingly apparent, and digital trade is emerging as a vital component of international commerce. This thesis analyzes the current development status of digital trade and the export of China's cross-border e-commerce. Based on the conceptual framework of digital trade proposed in previous studies and relevant statistical indicators, an index system for the development level of digital trade is established from three dimensions: digital infrastructure construction, digital trade environment, and the trade of ICT product. Utilizing principal component analysis, the thesis calculates and analyzes the composite index of digital trade development level for 22 trading partner countries from 2012 to 2022, evaluating and comparing the development status of digital trade in these countries. The results indicate a general upward trend in the development level of digital trade among the covered countries over the period, with high-income countries generally outperforming low-income countries, and this gap has not been narrowed over time.

Subsequently, this thesis employs an expanded gravity model to empirically investigate the impact of the importing country's digital trade development level on China's cross-border e-commerce exports. Robustness tests are conducted by replacing the method of calculating the digital trade development index and lagging the core variables by one period. The findings reveal a significant positive impact of digital trade development level on China's cross-border e-commerce exports. Based on the research results, recommendations are provided for the development of China's cross-border e-commerce from three perspectives: digital infrastructure construction, digital trade environment, and ICT industry development.