Professor Deng’s research has focused on wetland eco-hydrological processes, landscape pattern dynamics, and mountain hazard prevention, with particular emphasis on water flux mechanisms in marsh wetlands and the relationship between hydrological processes and wetland spatial structure. Through sustained field investigations in the Sanjiang Plain and Songnen Plain supported by the CAS Lake and Marsh Special Programme and the National Natural Science Foundation of China, he quantitatively characterised water flux processes at the interfaces of marsh wetland systems and examined the relationship between growing-season evapotranspiration and vegetation leaf area index. Building on surveys and spatial analyses of lakes and marshes in the Songnen Plain, he proposed the concept of “wetland water space” to describe the spatial organisation and hydrological functions of wetland water resources within plain landscapes. This framework provided a basis for understanding the spatial characteristics and temporal changes of floodplain wetlands under dynamic hydrological cycles, as well as their role in regulating regional water cycles and supporting water-resource regeneration and recovery. His research was presented at the 241st Xiangshan Science Conference on Wetland Degradation, Protection and Restoration in 2004, where he served as Co-Chair, and was subsequently included in the volume Science Frontiers and the Future. He also co-authored the monograph Introduction to Marsh Science under the leadership of Professor Liu Xingtu, contributing to the systematic development of marsh-wetland research in China. Through sustained field research, theoretical development, and scientific leadership, Professor Deng has contributed to strengthening the scientific foundations for wetland conservation, ecological restoration, and sustainable water-resource management in China and the broader Eurasian region.