In the four volumes of The Development Trajectory of Eastern Societies and the Theories and Practices of Socialism, the author re-examines Marx and Engels' theories on the development trajectory of Eastern societies by integrating theoretical analysis of Marxist theories and an historical investigation of socialist revolution and socialist construction around the world. Pointing out the guiding significance of five aspects of the basic principles of Marxism for studying how Eastern societies develop, this volume interrogates various assumptions that have prevailed in academia, addresses unexplained topics and offers insight into the understanding of these basic principles. The result is a penetrating and specific understanding of Marxist basic principles and the development trajectory of Eastern societies. Critical engagement with predominant understandings and a refreshing reformulation of Marxist theoretical bases make the book a key new reference for readers who are studying or are interested in Marxism, Marxist philosophy and the history of philosophy.