This book explores the establishment process, mechanism design, and role orientation of the Asian Infrastructure Investment Bank (AIIB) under the new background of global economic governance. After the international financial crisis in 2008, the process of economic globalization and the comparison of international forces have presented a new situation, and the global economic governance system since has entered a period of deep adjustment and transformation. At the same time, the problems and drawbacks of the original multilateral development financial system have become increasingly prominent. This not only provides a historical opportunity for the establishment of the AIIB, but also gives it a new important role in the global multilateral development financial system. The innovation of the AIIB's governance model, such as organizational structure, equity, and voting rights allocation, makes it more efficient in operation. And in practice, it is playing an increasingly important role in promoting policy connectivity, infrastructure connectivity, trade connectivity, financial connectivity and people-to-people connectivity of Asian region.