Carbon absorption and emission in the farmland ecosystem of Dezhou City in Shandong Provincewere estimated and their changes were analyzed based on the statistical data of crop yield,cultivated land areaand agricultural input from 2001to 2010.The total carbon absorption in the farmland ecosystem showed anincreasing trend during 2001-2010and the increasing trend was obvious after 2004.The carbon absorptionof wheat and corn,as the main grain crops,was significantly higher than other crops,and the carbon absorption of cotton,as the main cash crop,was not high.The carbon emission presented the trend from increasingto decreasing due to eco-efficient and high-quality crop development.Different counties had different carbonemissions because of different agricultural development directions and characteristics.The carbon emission ofchemical fertilizer contributes a higher percentage in three ways of carbon emissions,which showed a decreasing trend.The carbon absorption was far higher than the carbon emission in Dezhou City from 2001to2010.Farmland ecosystem of Dezhou City had an evident carbon sink function.