In the great practice of leading the Chinese revolution and construction, Mao Zedong formed abundant thoughts of the purity construction of the Communist Party of China. They mainly include: cleaning the purity construction is an important mission of the Communist Party of China; the service party is one of the main targets of purity construction of the proletarian party; Chairman Mao also put forward the key points on the purity construction of the Communist Party of China. Researching on Mao Zedong’s thought about the purity construction of the Communist Party of China has important practical significance on strengthening the purity construction of the Communist Party of China. Reconstructing the image of party cadres is not only the requirement of the era to promote the comprehensive and strict governance on the Communist Party of China, but also the basic conclusion of Mao Zedong’s theory on the purity construction of the Communist Party of China.