The construction of South Jiangsu modernization demonstration area bring an opportunity to build a “Strong rich beautiful high” new Jiangsu , while more reflected in the constraints of environmental system. Based on the statistical data of Jiangsu from 1995 to 2014, this paper calculate the carbon emissions in Jiangsu through improved KAYA model and a new method to estimate the secondary energy carbon emissions, then applies the simultaneous equations model to establish economic-environment simultaneous equations based on the introduction of FDI and carbon emissions in Jiangsu. The results show that the introduction of FDI in Jiangsu has a positive effect on the growth of carbon emissions in general, and there is a declining trend for carbon emissions per unit of GDP. The central section area of Jiangsu has the highest reduction effect, and the south is second, the north is last. Seeing from the carbon emissions and regional GDP’s positively correlated relationship, the economic development level of Jiangsu is still not reached the inflection point of environmental Kuznets curve with a inverted "U" shape. The study also shows that the secondary industry has bigger impact on carbon emissions, it is beneficial to reduce the FDI proportion of that industry for releasing the pressure on carbon emissions. Therefore this article put forward some advice.