全国统一大市场的建设是中国经济实现长期高质量发展的重要动力，数字经济是畅通循环、整合要素的关键力量。基于2011—2020年中国省级面板数据，在理论分析数字经济助推全国统一大市场建设的影响机制的基础上进行实证检验。实证结果表明，数字经济显著削弱了省际间的市场分割程度，促进了国内统一大市场形成。从作用机制上来看，数字经济可以通过赋能流通业发展进而推动国内统一大市场建设。采用门槛模型表明，数字经济和流通业发展对于助力国内统一大市场形成的正向影响存在门槛效应。

The construction of a unified national market is an important driving force for China's economy to achieve long-term high-quality development, and the digital economy is a key force in smoothing circulation and integrating factors. Based on China's provincial panel data from 2011 to 2020, this paper conducts empirical tests based on the theoretical analysis of the influence mechanism of digital economy in promoting the construction of a unified national market. Empirical results show that the digital economy significantly weakens the degree of interprovincial market segmentation and promotes the formation of a unified national market. From the perspective of operation mechanism, the digital economy can promote the construction of a unified domestic market by empowering the development of the circulation industry. The threshold model shows that the development of digital economy and circulation industry has a threshold effect on the positive impact of promoting the formation of a unified domestic market.