Guided by Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era and Historical Materialism, this book interprets the major political and theoretical proposition of the "two establishments (the establishments of Comrade Xi Jinping's core position on the CPC Central Committee and in the Party as a whole and the guiding role of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era)" in dimensions of theory, history, reality, future and practice. Its comprehensive, systematic, reader-friendly and clear explanation helps the majority of officials and the public to correctly identify the essence of the "two establishments", comprehending its decisive significance and implementing it.