关键词: 数字经济, 产业结构升级, 经济高质量发展, 溢出效应

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