This book conducts a multidisciplinary and multi-angle in-depth study of the history and theory of the Sinicization of Marxism, clarifies the political stance and scientific attitude of the Chinese Communists towards Marxism, reveals the main contents, salient characteristics, philosophical foundation and basic experience of the Sinicization of Marxism in different periods of revolution, construction and reform, discusses the dialectical relationship between the theoretical achievements of the two historical leaps in the Sinicization of Marxism, and sorts out the formation process, internal structure, obvious advantages and improvement requirements of the socialist system with Chinese characteristics. It embodies the organic unity of Marxist theoretical logic and the historical logic of China's social development, and has important reference value for deepening the study of the Sinicization of Marxism, effectively strengthening the party's theoretical construction, and better adhering to and developing socialism with Chinese characteristics.