From the establishment of the Party, to the completion of the new democratic revolution, from the period of socialist revolution and construction to the eve of reform and openingup, from the reform and openingup to the New Era, the ideological construction of the Communist Party of China in the past 100 years has experienced a complete course from exploration to maturing, from tortuous development to systematic development and then to gradually optimized layout. In the past 100 years, CPC has always been insisting on the unity of scientificity and value of ideological construction, holding the ideological banner of Chinese characteristics,  enhancing its vitality with innovation, and adhering to the combination of ideological construction and institutional construction. It is of theoretical value and practical significance to comb the history of the Partys centuryold ideological construction, which is the spiritual leader of the Party to maintain its original mission,  the theoretical weapon of the Party to remain pure and advanced, the ideological foundation for the Party to strengthen its own political construction and the “spiritual nourishment” for the Party to govern itself.