From the perspective of worldview and methodology, the "second combination" has unique and significant significance in the construction of modern Chinese civilization, which is reflected in three aspects: the "second combination" lays the prerequisite for ideological liberation in the construction of modern Chinese civilization; The "second combination" has secured the "root vein" and "soul vein" for the construction of modern Chinese civilization; The "second combination" has opened up a vast cultural space for the construction of modern civilization of the Chinese nation. The premise of ideological liberation has been laid for the construction of modern civilization of the Chinese nation. Modern civilization of the Chinese nation is a product of the combination of the basic principles of Marxism with China's specific reality and the excellent traditional culture of China. As the inheritance and development of scientific socialism, the modern civilization of the Chinese nation has always been at the forefront of the times in the process of creating new forms of human civilization, leading the trend of promoting the construction of a community with a shared future for mankind, and always leading the direction of human civilization development. Only then can we see the future and destiny of humanity. Since modern times, from the May Fourth Movement to the reform and opening up, every historical critical moment of the Chinese nation has been accompanied by ideological liberation, and the construction of modern Chinese civilization also requires ideological liberation. The "second combination" has awakened a conscious understanding of the excellent traditional Chinese culture and opened up the treasure trove of historical and cultural resources, undoubtedly a liberation of thought. In the centennial struggle of the CPC, there have been many times of ideological emancipation. Each time of ideological emancipation has promoted significant progress in China's social history, and each major historical moment will stimulate ideological emancipation. The May 4th Movement was an ideological liberation, which introduced Marxism into China and became the guiding ideology of the CPC. The discussion on the standards of truth was a liberation of thought, which opened up the reform and opening up. Today, the major cultural mission of building modern civilization of the Chinese nation is bound to stimulate new ideological liberation, require a broad mind and vision, and expand to the excellent traditional Chinese culture. This requires transcending the constraints of traditional thinking methods. It is in this sense that the "second combination" transcends the boundaries of previous understanding of Chinese excellent traditional culture, awakens a new understanding of Chinese excellent traditional culture, and provides new opportunities for the inheritance and development of Chinese excellent traditional culture in contemporary times, opens up new spaces, and points out new directions. This is undoubtedly a liberation of thought. To strengthen the "root vein" and "soul vein" of the construction of modern civilization of the Chinese nation, excellent traditional Chinese culture is the "root vein" of the construction of modern civilization of the Chinese nation. General Secretary Xi Jinping