Abstract: The Third Plenary Session of the 20th Central Committee of the Communist Party of China emphasized the commitment to the main task of institutional building in further comprehensively deepening reform. Clarifying the main motivations, rich connotations and practical pathways of the commitment to the main task of institutional building in further comprehensively deepening reform, deepening the understanding of the interactions between the reform and institution and its inherent laws，and accurately understanding its theoretical logic, historical logic and practical logic, are of great significance for improving the effectiveness of modern governance and highlighting the advantages of the socialist system with Chinese characteristics in the new era and new journey, which will be conductive to providing strong institutional impetus and institutional guarantee for the Chinese path to modernization.

Key words: further comprehensively deepen reform, institutional building, main motivations, rich connotations, practical pathways

摘要： 党的二十届三中全会强调，进一步全面深化改革要坚持以制度建设为主线。厘清进一步全面深化改革坚持以制度建设为主线的主要动因、丰富内涵及实践路径，深化对改革与制度之间互动关系及其内在规律的认识，准确领会其理论逻辑、历史逻辑和实践逻辑，对于新时代新征程提升现代化治理效能、彰显中国特色社会主义制度优势具有重要意义，将有利于为中国式现代化提供强大制度动力和制度保障。

关键词: 进一步全面深化改革, 制度建设, 主要动因, 丰富内涵, 实践路径