The carbon emissions has become an important problem for achieving the sustainable development. We have done a research on economy efficiency of energy consumption carbon emissions for each city of Hunan Province. Based on the OWA and Topsis method, the carbon emissions economy efficiency was measured, and its spatial difference was clustered. The results showed that:（1）a low carbon emissions economy efficiency was low in Hunan Province from the overall view;（2）a big spatial difference of carbon economy efficiency was occurred in Hunan Province.