This book approaches the subject matter of China’s transportation enterprises’ green development through a systematic, cross-industry framework that integrates policy analysis, market dynamics, technological innovation, and international comparisons. It transcends siloed sectoral studies by examining multiple transportation domains—including road, rail, water, civil aviation, pipeline, and urban rail transit—through unified lenses of eco-economic transformation. The methodology begins with a comprehensive mapping of each sector’s policy ecosystem, dissecting how national strategies like the “Double Carbon” goals and sector-specific regulations shape green transitions. It quantifies market scales and growth trajectories in empirical data. For each industry, this book assesses technological advancements—from new energy vehicle adoption in road transport to electrified rail networks—and their impact on operational efficiency and environmental sustainability. A distinctive approach is its cross-sectoral comparative analysis, which identifies synergies and transferable practices. For instance, it examines how electrification strategies in high-speed rail and smart automation in ports both drive energy efficiency, highlighting commonalities in green innovation across modes.