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.