The Blue Book of Yangtze River Delta is a report of the region that is published annually and generated by the academies of social sciences in Jiangsu, Zhejiang, and Shanghai. The theme of the report is “The Yangtze River Taking the Lead in Basic Realization of Modernization.” In 2008, the State Council officially approved the implementation of the Yangtze River Delta Regional Planning, and put forward clear goals and requirements for the Yangtze River Delta, allowing it to take the lead in the basic realization of modernization by 2020. Recently, the Party committees and governments of the areas of Jiangsu, Zhejiang, and Shanghai in the Yangtze River Delta have researched the planning, profoundly applied the scientific vision related to development, summarized the 11th Five-Year Plan's achievements, started to implement the 12th Five-Year Plan and embarked on a new journey of basic realization of modernization. Jiangsu was a leader in researching and applying an index system for basic modernization. There is major strategic significance for the entire country to quicken the basic modernization process of the Yangtze River Delta, which, realistically, has robust foundation and conditions. With deeper planning implementation and the 12th Five-Year Plans for Jiangsu, Zhejiang and Shanghai, the Yangtze River Delta has followed a new scientific economic and social development trend and is showing a promising prospect at home and abroad. It will also face certain critical contradictions and problems, and these must be tackled and solved through practical policy measures, to realize modernization on schedule. This way, there will be a more significant contribution to the entire country’s deepening reform, building a comprehensive, comfortable society, and realizing modernization. Considering this, the book analyzes, examines and delves into this topic at two basic levels. The first level comprises the general report and sub-reports, which study and delve into the basic modernization of the Yangtze River Delta generally, including the progress, foundation and outlook of basic modernization in the Yangtze River Delta, the process evaluation and path innovation of the basic modernization in Jiangsu Province, and the evaluation and analysis of the basic modernization in Zhejiang Province. The second level comprises the special research reports, which specifically study and delve into certain critical issues involving the promotion of the basic modernization construction of the Yangtze River Delta, for example, its economic transformation, innovation drivers, technological innovation service platform construction, agricultural modernization process, equipment manufacturing industry development, industrial circular economy, outward direct foreign investment, city-industry integration, urban agglomeration integration, urban modernization, urban-rural economic integration, coordinated regional development, ecological construction, social management innovation, construction of a high-level talent team, modernization of law, rural democratic construction and the development pattern of the Pan-Yangtze River Delta. We hope that the analysis and research at the two basic levels will contribute to the theoretical research, policy design and practical innovation of the Yangtze River Delta’s practice of leading basic realization of modernization.