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Based on the statistical data of Changsha-Zhuzhou-Xiangtan (CZT) urban agglomeration from the year 2005 to 2010, the environmental learning curves of sulfur dioxide emission per 10 thousand Yuan (RMB) production value and per capita gross domestic product (GDP) were established, and sulfur dioxide emission reduction potential of these cities was analyzed. The results show that the sulfur dioxide emission per 10 thousand Yuan production value declined exponentially with the increase of per capital GDP. From the perspective of time, the sulfur dioxide emission per 10 thousand Yuan production value is declining year by year along with economical development and level of technology improvement; from the perspective of space, the city with the largest potential of sulfur dioxide emission reduction is Zhuzhou, followed by Xiangtan, and then Changsha.