Mainly engaged in agricultural information collaborative service and rural development, land use and human-land relationship, regional sustainable development. In recent years, he has presided over the research and development of agricultural information network platform (deputy head of the tenth five-year plan), the evaluation index system and evaluation method model of efficient utilization of agricultural resources (the ninth five-year plan science and technology sub-project, the team leader), and the comprehensive development potential and industrial development of rural economy in the hilly area of the central loess plateau (the ninth five-year plan science and technology sub-project, Team leader), "Decision-making and Management Information System Development of Eco-agriculture Construction in Meso-basin of Loess Plateau" (Special Topic of Western Action Plan of Chinese Academy of Sciences, team leader), "Policy-driven Land Use Change and Sustainable Agriculture Response Model in Loess Plateau" (National Natural Science Foundation, team leader) and other scientific research tasks; At present, he is in charge of "Research and Integrated Application of Rural Information Collaborative Service Technology" (National Eleventh Five-Year Science and Technology Support Plan, project leader), "Research on Key Technologies of Semantic Retrieval of Agricultural Knowledge" (National Eleventh Five-Year Plan, project leader), "Vulnerability Analysis of Ecological Returning Farmland to Loess Plateau and Assessment of Farmers' Sustainable Livelihood" (National Natural Science Foundation, team leader) and "Research on Land Use Function and Regional Differentiation" (team leader of Chinese Academy of Sciences).