Abstract: The Third Plenary Session of the 20th Central Committee of the Communist Party of China proposed that further comprehensively deepening reform is the overall planning and deployment to advance the construction of Chinese modernization in a new era and a new journey. The ‘six adherences’ are the major principles that must be implemented to further comprehensively deepening reform, condensed the scientific summary of the historical experience of reform and opening up, and systematically answered the major theoretical and practical questions of‘what to change’ and ‘how to change’, which is of great importance for the profoundly understanding the comprehensively deepening reform ‘closely related to the theme of promoting Chinese modernization’. Taking the people’s position as the guide, starting from the actual situation and achieving‘three more emphases’ constitute the three major ideological methods for further comprehensively deepening reform, highlighting the people-oriented nature of the modernization direction, the practicality of the modernization path, and the scientific nature of modernization construction. Adhering to the pioneering spirit with the Party’s leadership as the fundamental guarantee, adhering to the spirit of commitment of ‘carrying out reforms to the end’, adhering to the spirit of upholding fundamental principles and breaking new ground that self-confidence and self-reliance to stimulate the vitality of reform, and adhering to the spirit of insisting on self-revolution with turning the blade inward are the practical character of the further comprehensively deepening reform, which will inject inexhaustible impetus into Chinese modernization.