The proposal of the great Party building spirit is an incisive summary of the CPC’s century-long struggle and a spiritual revelation of the CPC’s opening of a new century-long journey. To understand the great Party building spirit in the historical narrative of the hundred-year struggle, we should deeply grasp the truth core of strengthening the Party with theory, the value core of serving the people and the practice core of self-revolution. To understand the great Party building spirit in the grand narrative of the great rejuvenation, we should deeply grasp that the great Party building spirit has opened the great cause of socialism with Chinese characteristics, contained the historical mission of the great rejuvenation of the Chinese nation, and carried the strong force of Chinese civilization. To understand the great Party building spirit in the broad vision of world development, we should use the great Party building spirit to respond to the new requirements of the development of the times, explore the new form of human civilization, and explore the new direction of world development.