## 4 Results  
### Analysis of Dynamic Relationship between Economic Development and Ecological Environment  
The decoupling index of economic and ecological environment in Wuhan city from 2015 to 2020 was calculated, as shown in Table 5.  
The results of decoupling index of Wuhan from 2014 to 2020 are described below. Throughout the whole research period, most of the decoupling indices of Wuhan's economy and ecological environment were in a strong decoupling and weak decoupling state, i.e., the ecological loss had little relationship with economic development, indicating that Wuhan did not develop its economy at the expense of the environment, while the ecological environment and economic growth were in a relatively ideal state. From the analysis of the decoupling relationship, there were development differences and spatial heterogeneity. Wuchang, Jianghan, Qiaokou, and Jiangxia were all in the most ideal state of \"strong decoupling\" from 2014 to 2020, indicating that Wuchang, Jianghan, Qiaokou, and Jiangxia were in the process of urban economic development, while the ecological environment was also optimized. The relationship between the two was realized, and the city developed in a green and low-carbon direction. Jiang'an was only in a relatively ideal \"weak decoupling\" state in 2016, but in the most ideal \"strong decoupling\" state in other years, indicating that Jiang'an had a better green development and immediately mobilized the development direction after 2016. In line with urban economic development, the ecological environment was also optimized, and green and low-carbon development was continued. From 2014 to 2020, Hongshan transformed its development from a \"weak decoupling\" to \"strong decoupling\" state. Hongshan reached a \"strong decoupling\" state in 2017 and then a \"weak decoupling\" state until 2020. Qingshan was in a state of weak decoupling from 2014 to 2020. Qingshan is an important industrial town in Central China. Considering the development characteristics of the region, Qingshan should continue to promote green development, and further strengthen the pollution control and environmental protection in this heavy chemical industry city during the \"14 th Five Year Plan\". The Wuhan Economic Development Zone (Hannan) basically maintained the best state of \"strong decoupling\"; it actively changed its policy and continued to maintain an optimal \"weak decoupling\" state since 2016. Dongxihu was in a state of \"strong negative decoupling\" in 2016, which means that the ecological environment was declining, while the urban economic level is also regressing. According to the environmental bulletin of Dongxi Lake in 2016, it was found that the water quality of some lakes decreased slightly and did not reach the category of functional \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Year** & **2015** & **2016** & **2017** & **2018** & **2019** & **2020** \\ \hline Wuchang & \(-1.28\) & \(-0.43\) & \(-0.04\) & \(-0.27\) & \(-0.03\) & \(-0.45\) \\ Jianghan & \(-3.3\) & \(-1.71\) & \(-1.33\) & \(-1.39\) & \(-0.95\) & \(-2.14\) \\ Jiang’an & \(-2.62\) & \(0.02\) & \(-0.1\) & \(-0.34\) & \(-0.1\) & \(-0.42\) \\ Hongshan & \(0.16\) & \(0.32\) & \(-0.23\) & \(0.1\) & \(0.11\) & \(0.17\) \\ Qiaokou & \(-14.29\) & \(-2.68\) & \(-1.66\) & \(-2.33\) & \(-1.14\) & \(-2.4\) \\ Qingshan & \(0.46\) & \(0.17\) & \(0.14\) & \(0.65\) & \(0.23\) & \(0.63\) \\ Hannan & \(-0.04\) & \(0.02\) & \(-0.02\) & \(-0.01\) & \(-0.01\) & \(-0.08\) \\ Dongxihu & \(-0.63\) & \(-0.05\) & \(-1.43\) & \(-0.21\) & \(0.01\) & \(-0.14\) \\ Huanggi & \(-0.95\) & \(-0.23\) & \(-0.64\) & \(-0.29\) & \(-0.02\) & \(-0.04\) \\ Xinzhou & \(46.1\) & \(3.34\) & \(-3.93\) & \(-1.28\) & \(-0.19\) & \(-0.1\) \\ Jiangxia & \(-0.06\) & \(-0.21\) & \(-0.14\) & \(-0.17\) & \(-0.15\) & \(-0.09\) \\ Hanyang & \(-0.16\) & \(0.53\) & \(-0.2\) & \(4.36\) & \(-0.13\) & \(4.07\) \\ Caidian & \(-0.08\) & \(-1.42\) & \(0.16\) & \(-1.05\) & \(0.42\) & \(0.14\) \\ \hline \hline \end{tabular}
\end{table}