Abstract: The system for overall leadership of the CPC is the fundamental leadership system of China. It is established by the Party and state authoritative organizations for the purpose of defining reasonable and effective power allocation and authority-subordinate relationship. With the "dominance" and "center" position in national governance, the system has important functions of driving effective governance, enhancing political trust and promoting national development, and can improve the governing ability of the CPC on the dimensions of science, democracy and law. The provisions of the fourth plenary session of the 19th central committee of the CPC on the Party's leadership system are of great significance in promoting the institutionalization, standardization and routinization of the overall leadership, and the clarity, scientization and perfection of national governance, eliminating the misunderstanding of the overall leadership. The system for overall leadership of the CPC has it's inner logic: the foundation lies in the practice of comprehensive leadership, the goal is to ensure the correct direction of development, the value standpoint is taking the people as the center, the primary task is to safeguard the authority of the CPC central committee and its centralized and unified leadership, the basic principle is overall governance and coordination, and the fundamental guarantee is the comprehensively strict governance of the Party.