As a new type of political party system, the socialist political party system with Chinese characteristics is an important political system created by the Communist Party of China, the Chinese people, non-Communist parties and non-party personages based on China's specific national conditions over the past 100 years and the specific modernization goal of realizing national great rejuvenation. From the establishment of the Communist Party of China to the formation and maturity of this system, the historical regularity demonstrated in the course of development over the past century, the scientific nature of the structure and function of the party system, the rationality of the party system's operation, and the effectiveness of the party system's national governance performance, have become the main sources of the superiority of the socialist party system with Chinese characteristics. In the context of world changes that have not been seen in a century and the overall domestic situation of building a socialist country, these four sources need to be integrated in the two dimensions of theory and practice to jointly shape the superiority of the socialist party system with Chinese characteristics and strengthen the explanatory power and persuasive power of its superiority. And on this basis, a set of persuasive and communicable discourse system of the superiority of the socialist party system with Chinese characteristics can be constructed, so as to clarify its important contribution to world political party system and party theory.