As a distinctive feature and fine tradition of our Party,the ideological construction of the Communist Party of China has accumulated a lot of valuable experience in different stages of the revolution during the process of the New-democratic Revolution.The Party’s main work was to propagate Marxism and fight non-proletarian thought with proletarian thought in the early days of its founding;during the Period of the Great Revolution,its ideological construction moved forward in the fold,and the theory of ideological Party construction began to sprout;during the Agrarian Revolutionary War,the Party Central Committee represented by Mao Zedong combined the basic principals of Marxism with the concrete practice of Chinese revolution,and the theory of ideological Party construction was formed and developed further;during the period of Anti-Japanese War,great breakthroughs were made in the theory of ideological Party construction,seeking truth from facts became the Party’s ideological line,and Mao Zedong thought was established as the Party’s guiding thoughts;during the period of Liberation War,new progress was made in ideological Party construction.The Party creatively launched campaigns to consolidate the Party and the army and to correct erroneous thinking,and put forward construction thoughts of the proletarian Party in power preliminary.Through the analysis of the development context of the ideological Party construction during the New-democratic Revolution period,some important lessons,such as insisting on giving top priority to ideological construction in Party building,upholding the innovating of the Party’s ideological construction in practice,and insisting on arming the whole Party with innovative theories can be drawn.