Abstract: This paper, building upon the keynote presentation of the 2nd Wang's Lecture, provides a systematic overview of Wang Sijing's outstanding contributions and core academic concepts in the development of engineering geomechanics and engineering geology in China. The paper first pays tribute to the scientific spirit he embodied throughout his career. It then reviews the significant trajectory of engineering geomechanics in China, initiated and led by Gu Dezhen. The core of the paper elaborates on Wang Sijing's theoretical and conceptual framework, structured around three aspects: (1) the formation of engineering geology in China through the integration of theory, technical methods, and practical engineering experience; (2) his pioneering advocacy for environmental engineering geology, bridging traditional engineering geomechanics with human-earth relations; and (3) his systematic approach to engineering geological methodology, ranging from core values to the comprehensive theory of Meta-Synthesis. Finally, the paper introduces recent innovative and practical advancements in China's engineering geology, inspired and guided by Wang Sijing's academic legacy, particularly in areas such as complex rock and soil mass characteristics, engineering-environment interaction and geological hazard risk science, multidisciplinary integration and intelligent methods, and contributions to national major strategies and the future of the discipline. Wang Sijing's academic work not only laid a solid foundation for engineering geomechanics in China but also continues to offer invaluable theoretical guidance and methodological principles for the discipline to address future complex challenges, effectively serve national major needs, and pursue sustainable development.