Professor of China Agricultural University, outstanding teacher of Baosteel, Ministry of Education. Specially-appointed expert on the quality utilization and construction of cultivated land from the Ministry of Natural Resources, a member of the Sino-Europe Panel on Land and Soil (SEPLS), and a peer review expert from the Department of Earth Sciences and the Department of Management of the National Natural Science Foundation of China. He is mainly engaged in the research on the theory and mechanism innovation of cultivated land resource utilization, evaluation and protection. He has published more than 150 articles in Chinese and English such as "Nature", published 7 monographs, 3 textbooks, and took the lead in formulating 3 national industry standards and norms. Presided over more than 30 projects including the National Natural Science Foundation of China, the Philosophy and Social Science Foundation of China, and major provincial and ministerial projects, and put forward 10 policy recommendations for the use and protection of cultivated land, which were transformed into the national permanent basic farmland delimitation and the Huanghuaihai groundwater overexploitation area farmland fallow policy.