Abstract: The great party-building spirit is the spiritual source of the CPC，the foundation of the party-formation，the soul of the party-progress and the formation of strengthening the party. The great party-building spirit is a valuable spiritual treasure cultivated by the CPC in its long-term practice and persevered for a long time，a  spiritual code answering "why the CPC can lead China to national rejuvenation?"，and a spiritual "red thread" of understanding major achievements and historical experience of the CPC's century-long struggle. The great party-building spirit is the theoretical and spiritual result of combining the basic principles of Marxism with the concrete reality of China and with the excellent Chinese traditional culture，as well as the convergence and integration of the excellent Chinese traditional culture，revolutionary culture and advanced socialist culture. The great party-building spirit is carried out in the CPC's long-term struggle，which has driven the revolution，construction and reform to make significant achievements and provided a deep，lasting  active spiritual power for the great rejuvenation of the Chinese nation. The great party-building spirit is not only the basic point and origin of the spiritual pedigree of the Chinese Communists，but also a continuation and promotion of the fine traditions and spiritual lineage of the Chinese Communists. The great party-building spirit has played the strongest voice of development of the times-not forgetting the original intention and practicing the mission，and become the spiritual source and spiritual force of the unremitting struggle of the whole CPC and society by Internalizing it into the heart and externalized it in action. 

Key words: the great Party-building spirit, the Communist Party of China, history, culture, the people