This book mainly includes some theoretical articles on the author's study of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era since the 18th National Congress of the Communist Party of China, focusing on Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era as the theoretical form of Marxism in China in the 21st century, mainly including three aspects: first, interpreting the historical inevitability of China's road and the scientific rationality of China's system from a philosophical perspective; second, it explains the basic connotation of Xi Jinping's thought on socialist culture with Chinese characteristics in the new era; Third, it explains the philosophical ideas contained in the report of the 19th National Congress of the Communist Party of China.