本文梳理我党在革命时期和建设时期对党的性质、党员成份及其相互关系的艰难探索 ,描述了党在历史上对党的性质的规定是如何深化 ,党对党员的社会成分的规定又是如何演进的 ,历史地阐述了中国共产党为什么必须是“两个先锋队”的代表。 This article combs the hard exploration of our party in the revolutionary period and the construction period about the nature of the party, the composition of the party members and their mutual relations. It describes how the party’s rules on the nature of the party have been deepened in history and the party’s rules on the social components of party members How it evolved, and historically elaborated on why the Chinese Communist Party must be the representative of the “two vanguards.”