Land use change is an important factor on carbon emission. With the new-type urbanization, industrialization, informatization and agricultural modernization process accelerating, there appears the fast expansion in urban construction land use and development, especially in the urban development pattern of high consumption,high emission and high pollution, which resulted not only in the rapid growth of social carbon emissions,but also in the weakening of carbon sinks function of urban land, leading to the global warming, and the deterioration of the living environment. Therefore,the low-carbon use of urban construction land will be the new hot spot of the study in the fields of the urban science and environmental science. The purpose of this paper is to analyze the characteristics of changes in urban construction land use in Yancheng City from 2002 to 2012,calculate and analyze the carbon emissions influenced by different urban construction land use types from 2002 to 2012 according to the assessment model of carbon emission and grey relationship method, describe the coordinative degrees of different urban construction land use types in Yancheng City from 2002 to 2012,keep the harmonious relationship between human beings and environment, and reach the goal of sustainable development of society. The results show that the transportation land and industrial land accounted for a major proportion of the total carbon emission from urban construction land use types in Yancheng City from 2002 to 2012. Carbon emissions increased most quickly in the residential land and the commercial service land city,from 5.607 * 10~5 tons in 2002 to 1.471 3*10~6 tons with an average annual growth rate of 14.76% and from 6.55*10~4 tons in 2002 to 2.762*10~5 tons with an average annual growth rate of 29.24% during the study periods, respectively. The results also show the decrease tendency of coordinative degree between different urban construction land use types in the years of 2002 and 2012. The good and very good degrees accounted for 50% of the total analyzed samples. Some further policy options should be proposed to mitigate problems more thoroughly, including reducing carbon emissions and increasing carbon sinks, protecting wetland and forestland, practicing the scientific concept of development, enhancing the efficiency of land use and energy consumption, coordinating the development of the economy and the land utility, and strengthening the control functions of land use planning to reduce carbon emissions.