B a c k g r o u n d . Deng Xiaoping is considered the main architect of socialist reforms and the founder of China's modernization theory. He mastered and developed the socialist system, trying to adjust it to the national conditions of China. Deng Xiaoping believed that it was by following the course of "socialism with Chinese characteristics" that China would transform from a poor country into a highly developed one. The article provides a theoretical reconstruction of the main content of Deng Xiaoping's concept of "socialism with Chinese characteristics." The main philosophical and socio-political aspects of the concept of building socialism with Chinese characteristics are presented in a systematic form in the context of the foundations of Chineseization of Marxism. M e t h o d s . In the article, a historical-logical approach was used to reveal the specified research topic, which allowed us to determine the socio-political prerequisites for the emergence of Chineseized Marxism. An interdisciplinary approach made it possible to carry out a theoretical analysis of social, economic, and political changes in modern China, which were caused by the proposed theory of Deng Xiaoping's "socialism with Chinese characteristics". Systemic, structural-functional, and constructivist methods, as well as methods of synthesis and generalization, were also applied. R e s u l t s . Because of the above, the purpose of this study was to carry out a theoretical reconstruction of Deng Xiaoping's theory of building "socialism with Chinese characteristics" and to find out how his ideas influenced the development of modern China after the completion of the "Great Leap Forward" and the "Cultural Revolution" of Mao Zedong. The key features of Deng Xiaoping's proposed theory of "socialism with Chinese characteristics" were established, including the idea of democratization of society and implementation of the legal basis of state functioning; the beginning of a new period of "reforms and openness"; determining the course for socialist modernization; following Marxism-Leninism and the ideas of Mao Zedong. C o n c l u s i o n s . In conclusion, it can be noted that the main feature of Deng Xiaoping's ideas was that they were inextricably linked with the national and cultural traditions of Chinese civilization, starting from Confucianism and the gradual synthesis with Marxist ideology. Evaluating the theory of Deng Xiaoping, it can be defined as a relatively complete scientific system that covers the fields of philosophy, political economy, and scientific socialism, it contains the doctrine of socialist ideology, and the doctrine of the essence and ways of socialist development, theories of the reform of socialist political and economic systems, the theory of building a socialist country.