This book aims to comprehensively analyze the internal relationship between the digital economy and high-quality economic development. Through a combination of theoretical and empirical analysis, it reveals the action mechanisms, influence paths, and practical effects of the digital economy on high-quality economic development. With the core goal of uncovering how the digital economy affects high-quality economic development in terms of mechanisms, paths, and outcomes, the book presents a clear and comprehensive research panorama for readers through the integration of theoretical and empirical approaches. At the beginning, the book provides a detailed introduction to the relevant connotations of the digital economy and high-quality economic development, clarifying their basic concepts, development trajectories, and important positions in the current economic system. Subsequently, from a theoretical perspective, it deeply analyzes the multiple impacts of the digital economy on high-quality economic development, including direct effects, threshold effects, and mediating effects. This not only lays a solid theoretical foundation for the subsequent empirical analysis but also offers strong support for readers to understand the intrinsic connections between the digital economy and high-quality economic development.