提高全要素生产率是高质量发展的动力源泉，全国统一大市场建设对全要素生产率有正向促进作用。本文使用31个省级行政区的面板数据，实证研究国内市场一体化对全要素生产率的影响。研究结果发现，国内市场一体化整体上对全要素生产率有着正向影响，但具有两个方面的异质性：①在西部地区有显著正向影响，在东北地区有显著负向影响，在东部地区和中部地区影响不明显；②市场一体化主要促进的是内陆城市全要素生产率的提升。本文还发现，国内市场一体化通过规模协同效应和知识溢出效应两个机制影响全要素生产率。政府有关部门和市场主体应充分认识二者关系，避免政府权力机构的行政垄断和企业运用市场势力的垄断等，消除地区间商品和要素流通的壁垒，从而实现资源配置效率的优化。

Elevating total factor productivity (TFP) serves as the driving force for high-quality development, and the construction of a unified national market positively promotes TFP. This paper employs panel data from 31 provincial-level administrative regions to empirically investigate the impact of domestic market integration on TFP. The results suggest that domestic market integration generally exerts a positive influence on TFP but exhibits heterogeneity in two aspects: (1) there are significant positive effects in western regions, significant negative effects in northeastern regions, and inconclusive effects in eastern and central regions; (2) market integration primarily facilitates the enhancement of TFP in inland cities. Furthermore, this study finds that domestic market integration affects TFP through the mechanisms of economies of scale and knowledge spillovers. Government departments and market entities should fully recognize the relationship between these mechanisms, avoiding administrative monopolies by government agencies and market power monopolies by enterprises, eliminating barriers to the circulation of goods and factors between regions, and thereby optimizing resource allocation efficiency.