Abstract: This article argues that the Communist Party of China was the product of applying Marxism-Leninism in the Chinese workers' movement, this "applying" is the process which is from brewing to founding, so it was a proletarian party who has a clear proletarian nature ever since its founding. After exercising political power, the Communist Party of China always represents the fundamental interests of the overwhelming majority of the people in China and keeps its advancedness. At the same time, this article brings forward a few problems about some vague ideas on the nature of the Party at this stage.