Under the background of "dual-carbon" target, quantitative assessment and analysis of carbon footprint changes are of great significance for "dual-control" of carbon emissions.The paper taking the Beijing-Tianjin-Hebei urban agglomeration as an example, we measure the carbon footprint based on the land use data, the net primary productivity (NPP) of vegetation and the carbon emission data from 2005 to 2021, and analyse the trend of its change and the factors affecting it. It is found that: (1) The multi-year average of carbon emissions in the Beijing-Tianjin-Hebei region during the study period was 0.11 Pg C/a, with an average growth rate of 3.35 per cent and an overall trend of significant growth; the multi-year average of NPP was 0.35 Pg C/a, with an average growth rate of 0.25 per cent, and an overall up-and-down trend. ; (2) During the study period, the carbon footprint and carbon deficit in the Beijing-Tianjin-Hebei region showed a clear upward trend, with annual average growth rates of 3.28% and 1.27%, respectively, while the changes in the carbon footprint showed a spatial distribution pattern of ‘Northeast-Southwest’, and there were obvious regional differences, and the carbon footprint pressure index showed a multi-polarisation trend. ; (3) The urbanisation rate is the core driver of carbon footprint change in the Beijing-Tianjin-Hebei region, and its change is also affected by multiple factors, especially the interaction between urbanisation rate and energy efficiency has the most significant effect on carbon footprint.