The "greenhouse effect" has made energy carbon emissions become an important environmental issue at home and abroad. How to reduce carbon emissions while maintaining economic growth has become a common challenge for all regions. Wuxi is located in the energy consumption center of South of Jiangsu, and has a large amount of energy consumption. This paper uses the Tapio decoupling model and takes 2007 as the first base year to analyze the carbon emission and economic development level of Wuxi from 2008 to 2016. It is found that the carbon emission and economic development in Wuxi are in a weak decoupling state, and the carbon emissions are mainly from coal-based energy sources. There is still the potential transformation to achieve strong decoupling. According to the conclusions, this paper proposes emission reduction proposals in order to provide scientific reference for the construction of low-carbon cities in Wuxi.