The book analyzes the logic, goals, and tasks of the new development stage as well as its relationship with the new development dynamic and high-quality development. Through this book, we can accurately grasp the nature and historical position of the new development stage, and understand the basis for proposing the new development stage and its goals and tasks. We can also have a clear idea of the priorities that the Party and the country must work on at present and in the next stage， that is, “ground our efforts in the new development stage, apply our new development philosophy, foster the new development dynamic, and promote high-quality development.” Thus, we will understand the importance, necessity, and implementation approach of the CPC Central Committee’s various plans as China is embarking on the new journey to build a modern socialist country in an all-round way. This theoretical work may enlighten our minds and guide our practice.