Philosophy is the theoretical self-awareness of human beings. Philosophical thought is contained in major philosophical propositions. The innovation of philosophical thought in fact lies in new explanation or invention of major philosophical propositions. A history of philosophy is a history of criticizing and reflecting on existing philosophical propositions and endowing them new connotations of the time on the one hand and creatively proposing new philosophical propositions on the other. By analyzing the intellectual history of Marxist philosophy in China since the modern times, we find that the innovation of philosophical theories and new explanations of philosophical propositions have been interwoven with each other and co-composed new chapters of the sinicization of Marxist philosophy. The study of China's Marxist philosophy and the construction of its academic system shall be centered on deep explanations of the three philosophical propositions that contain theoretical wisdom and the spirit of the time: “casting the consciousness of Chinese national community”, “constructing community with shared future for mankind” and “realizing the people's aspiration for a better life”. Hence, it contributes intellectual wisdom to a great rejuvenation of Chinese nation.