Themed on the historical logic of Chinese Communist Party maintaining ideological purity, this paper explores the related issues. To "explore the source", this paper makes a brief overview of theconnotation and concept of Chinese Communist Party maintaining the ideological purity. It starts mainly from the Marx's classical works, to maintain the party's ideological purity of the proletariat, the Chinese Communist Party of its theoretical development; and from a historical view, further discusses the effect of current Chinese social development on Chinese Communist Party's ideological purity. It suggests that the majority of Party and government cadres practice the mass line, carry out a comprehensive Anti-corruption Governance, and maintain the purity of the party.