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中国的崛起依靠对外开放以及开放型经济的发展，对外开放有效整合了全球资源，使之充分适应经济全球化的竞争环境，开放型经济的发展开启了中国现代经济的高速增长之路，推动了中国的工业化、城市化进程以及国内体制改革，提升了中国在国际格局中的地位，为国家的发展带来巨大收益。近年来数字经济迅速发展，作为一种新兴经济，数字经济已经成为助推国民经济发展的关键动力。数字经济的发展加快了开放型经济的构建，在新发展格局的背景下，深入研究数字经济对开放型经济发展的作用机理，不仅可以为经济开放发展提供新的思路，也可以为数字经济发展实践提供相应的政策参考。

本文选取2013—2021年中国省际面板数据，分别构建数字经济发展水平评价指标体系和开放型经济发展水平评价指标体系，运用熵值法分别测算30个省份（西藏、港澳台除外）不同年份的数字经济发展水平以及开放型经济发展水平，并分析我国各省份数字经济和开放型经济发展水平现状。采用双向固定效应模型、中介效应模型等计量方法，实证检验了数字经济对开放型经济发展水平的直接影响机制与间接影响机制，探究数字经济对开放型经济发展的作用机理，同时充分考虑数字经济对开放型经济发展的区域异质性 ，在区分东中西部地区的基础上，深入探究了数字经济整体以及数字经济子维度对开放型经济发展的影响程度。

研究表明： 第一，全国各省份数字经济发展水平呈现上升趋势，无论是数字经济发展水平还是发展速度，均呈现出东部地区发展水平最高、中部地区次之、西部地区最低的特征。

第二，全国各省份开放型经济发展水平整体上呈现上升趋势，东部地区开放型经济发展水平高于中西部地区，而中部地区发展速度最快，东部地区次之，西部地区最慢。

第三，数字经济发展水平和各子维度均能促进开放型经济的发展，通过一系列稳健性检验，该结论仍然成立。

第四，数字经济发展水平和各子维度对开放型经济发展水平的影响存在区域异质性。

第五，数字经济可以通过技术创新、产业结构升级、市场化程度促进开放型经济发展。

China's rise relies on opening up to the outside world and the development of an open economy, which effectively integrates global resources to fully adapt to the competitive environment of economic globalization, and the development of an open economy has opened up the road of China's modern economy to high-speed growth, pushed forward the process of China's industrialization and urbanization as well as the reform of the domestic system, and enhanced China's position in the international landscape, bringing great benefits to the country's development. The digital economy has developed rapidly in recent years, and as an emerging economy, it has become a key driving force in fueling the development of the national economy. The development of digital economy has accelerated the construction of open economy, in the context of the new development pattern, in-depth study of the mechanism of the role of digital economy on the development of open economy can not only provide new ideas for the open development of the economy, but also provide corresponding policy references for the practice of digital economy development.

This paper selects China's inter-provincial panel data from 2013 to 2021, constructs the evaluation index system of the level of digital economy development and the evaluation index system of the level of open economy development respectively, applies the entropy method to measure the level of digital economy development as well as the level of open economy development of 30 provinces (except Tibet, Hong Kong, Macao, and Taiwan) in different years, and analyzes the level of digital economy and open economy development of each province in China Current status. Using two-way fixed-effects model, mediated-effects model and other measurement methods, we empirically tested the direct and indirect impact mechanisms of digital economy on the level of open economy development, and explored the mechanism of digital economy on open economy development, while fully taking into account the regional heterogeneity of the digital economy on the development of open economy, and on the basis of distinguishing between the eastern, middle, and western regions, we deeply explored the impacts of the digital economy as a whole and the   subdimensions of digital economy on the development of the open economy, and analyzed the status of digital economy and open economy development level in each province of China. On the basis of differentiating between the eastern, central and western regions, the degree of influence of the digital economy as a whole and the sub-dimensions of the digital economy on the development of open economy is deeply investigated.

The study shows that: First, the level of digital economy development in all provinces of the country shows an upward trend, both in terms of the level and speed of digital economy development, characterized by the highest level of development in the eastern region, the second in the central region, and the lowest in the western region.

Second, the level of open economy development in all provinces of the country as a whole shows an upward trend, with the level of open economy development in the eastern region higher than that in the central and western regions, while the central region develops at the fastest pace of development, followed by the eastern region, and the western region at the slowest pace.

Third, the level of digital economy development and each sub-dimension can promote the development of open economy, and the conclusion still holds through a series of robustness tests.

Fourth, there is regional heterogeneity in the impact of the level of digital economy development and each sub-dimension on the level of open economy development.

Fifth, the digital economy can promote the development of open economy through technological innovation, industrial structure upgrading, and the degree of marketization.