In the four volumes of The Development Trajectory of Eastern Society and the Theories and Practices of Socialism , the author re-examines Marx and Engel's theories on the development trajectory of the Eastern societies by integrating theoretical analysis of Marxist theories and a historical investigation of socialist revolution and construction around the world. This volume discusses the victories and failures of the 100-year trajectory of socialism. Since the Russian Revolution of October 1917, socialism has been practiced for nearly a hundred years in countries at various stages of development. The author provides a proper synthesis of the lessons derived from socialism's first hundred years as well as China's reforms and interaction with the world. In addition, he analyzes Marx and Engels' socialist theories and their significance for contemporary social development in Eastern societies. Readers who study Marxism, Marxist philosophy, philosophical history and the history of philosophy will find this volume of immense interest.