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In recent years,with the acceleration of urbanization and urban sprawl,land use and cover change significantly changed carbon budget of urban and urban agglomeration.Therefore,its increasingly necessary to study urban agglomeration carbon metabolic structure and function change resulting from land use and cover change.From the perspective of land use and cover change,we selected 18 land use types of 179 county in Jing-Jin-Ji as nodes,and carbon transfers among different types of land as paths,and then established an ecological network model of Jing-Jin-Ji urban agglomeration carbon metabolism.Combined with GIS,we explored spatial and temporal pattern of carbon metabolism structure and ecological relationships of urban agglomeration.