Xi Jinping's important exposition on the reform of the national supervisory system has an important position in Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era and national supervisory work in the new era, and urgently needs to be studied in depth. From the perspective of text analysis we find that the important discourse follows the logical clues of "the cause of reform — the goal of reform — the follow-up task of reform". The main contents include: the practice of state supervision system reform needs to make up for the structural and functional defects of the original discipline inspection and anti-corruption system, and realistic goals. It is a new type of national supervision system that shapes the Party's unified leadership, centralization and unity, and effective and comprehensive coverage. The main task of continuing to deepen reform is to ensure the integrity and effectiveness of the supervision power. The era value of Xi Jinping's important exposition on the reform of the national supervisory system lies in: on the one hand, from a theoretical point of view, it represents the latest achievement of the sinicization of the Marxist supervisory theory. Xi Jinping combined the specific national conditions and characteristics of the new era, developed and innovated the previous administrative supervision theory from the dimension of political system optimization; on the other hand, from a practical perspective, it guides China to build a national supervision system with Chinese characteristics and unique advantages, and contributes the Chinese plan to solving the problem of power supervision for long-term ruling political parties around the world.