Abstract: 【Objective】 This paper aimed to analyze the change trend and correlation degree of land use and carbon emission in Lanzhou from 2009 to 2020,providing a scientific basis for Lanzhou achieving the goals of " carbon peaking and carbon neutrality " and building a low-carbon city.【Method】 Based on the data on land use change,energy and agricultural chemical consumption in Lanzhou from 2009 to 2020,land use diversity index and dynamic attitude were calculated to analyze the change in land use in Lanzhou. The calculation model of land-use carbon emissions was constructed to calculate and analyze the change trend of land-use carbon emissions in Lanzhou. Grey correlation analysis method was used to analyze the correlation degree of land use and carbon emission in Lanzhou.【Result】 From 2009 to 2020,the land-use diversity index increased from 0. 602 9 to 0. 647 6. Net carbon emissions from land use decreased from 21. 612,300tons to 21. 137 00 tons. The grey correlation of the net carbon emission with cultivated land,grassland,water area,other land,forest land,construction land and garden land was 0. 90,0. 91,0. 89,0. 90,0. 90,0. 90,0. 89,respectively.【Conclusion】 From 2009 to 2020,the land use diversity index showed an upward trend,and the land use structure tended to be diversified. From 2009 to 2020,the carbon source and net carbon emissions in Lanzhou showed a downward trend,while the carbon sink began to increase gradually in 2019.In the system of carbon emission in Lanzhou City,the construction land is the largest carbon source and forest land is the largest carbon sink. The change of net carbon emissions is closely linked to the change of grassland,cultivated land,forest land and construction land area in Lanzhou City.