Abstract: The Party’s 20th National Congress report put forward the original proposition of “the unique problems of a large party”, the basic connotation of which can be interpreted through the Party’s own attributes. The Party’s mission, revolution and youthfulness are symbiotic and inseparable organic wholes, and they will face corresponding difficulties in the process of deepening the practice of the Party’s original mission. Mission requires that the Party should always remember its original intention and mission, and must have strong governing ability and leadership to consolidate long-term power; revolution requires that the Party should have a high degree of internal unity, and must always find and solve its own defects; youth requires that the Party should always maintain a full state of mind, and must gather the strength of youth in a clean and upright political ecology. Problems of mission, revolution and youthfulness together constitute the basic connotation of the “unique problems of a large Party”.