As early as the Yan’an R ectification Movement in the ear ly 1940s, the CPC grad ually formed its systematic theory of Party building that covers the Party’s theoretical development, organization, and conduct. Building on the experience of the previous four generations of CPC central leadership, the Central Committee led by Xi Jinping has made major innovations in terms of the theory and practice of Party building, aiming to propel the development of the Party to a new stage characterized by full and strict governance over the Party. This book examines how Xi Jinping has deepened the Party’s understanding of the principles, requirements, and approaches of Party building in the new era. It analyzes his expositions and policies on the tasks of Party building—strengthening the Party’s political, ideological, institutional, and organizational development, fighting corruption, maintaining its advanced nature and integrity, and enhancing its long-term governing capacity. The book also explores how these tasks are key to the Party’s effort to lead the nation in overcoming the new challenges, advancing Chinese socialism, and striving for national rejuvenation.