Abstract: The digital economy is the driving force behind achieving highquality economic development in the new era. Based on the new development philosophy and the profound implications of highquality economic development， this study examines the interplay between the digital economy and highquality economic development from the perspective of industrial structure upgrading. Using panel data at the city level from 2011 to 2021 in China， various econometric methods are employed to systematically explore the underlying mechanisms and impact effects between the digital economy and highquality economic development. The results indicate that the digital economy significantly enhances the level of highquality economic development， and this conclusion remains valid after a series of robustness tests; mechanism analysis indicates that after the ‘digitalindustrial decoupling’ phenomenon is effectively alleviated， the digital economy will continuously support the transformation and upgrading of traditional industries， thereby promoting the achievement of highquality economic development. Heterogeneity analysis shows that the digital economy plays a significant driving role in Chinas eastern， central， and western regions， with the central region exhibiting the most prominent driving effect; from the perspective of urban heterogeneity， due to endowments such as firstmover advantages， the digital economys driving force is stronger in class I cities than in class II cities. Additionally， the impact of the digital economy on highquality economic development exhibits nonlinear spillover effects with increasing marginal returns and spatial spillover effects. The digital economy will leverage the combined effects of these factors to support the achievement of Chinas goal of highquality economic development through regional coordination.

Key words: digital economy, industrial structure upgrading, highquality economic development, spillover effect

摘要： 数字经济是实现新时代经济高质量发展的驱动力。基于新发展理念和经济高质量发展的深刻内涵，从产业结构升级的角度出发，基于我国2011—2021年城市面板数据，运用多种计量方法系统探究数字经济与经济高质量发展二者间的作用机理及影响效应。结果表明，数字经济显著提升经济高质量发展水平，通过一系列稳健性检验后该结论仍然成立。机制分析表明，在“数—产脱轨”现象有效缓解后，数字经济将不断助力传统产业转型升级，助推实现经济高质量发展。异质性分析表明：我国东、中、西部地区数字经济驱动作用显著，其中中部地区驱动效果最为突显；从城市异质性看，鉴于先发优势等禀赋，Ⅰ类城市数字经济驱动力强于Ⅱ类城市。此外，数字经济对经济高质量发展的影响存在边际递增的非线性溢出效应以及空间溢出效应。数字经济将通过“效应”合力助力实现我国区域协调发展的经济高质量发展目标。

关键词: 数字经济, 产业结构升级, 经济高质量发展, 溢出效应