Professor Liu’s research has centred on land resources, fragile ecosystems, and environmental change, with particular emphasis on the Qinghai–Tibet Plateau and the Hengduan Mountains. Through extensive field investigations and long-term research in these regions, he has contributed to studies of land-use change, ecological vulnerability, and sustainable development. He has authored more than ten monographs and numerous peer-reviewed publications and has participated in national strategic programmes concerning sustainable development, climate change, and scientific and technological innovation. His professional activities have also included service on international advisory bodies, including the International Risk Governance Council (IRGC), and engagement in international scientific cooperation. Through sustained research, policy work, and participation in national and international scientific initiatives, Professor Liu has contributed to the application of geographical and environmental science to questions of natural-resource management, climate change response, innovation policy, and sustainable development.