## 4 Results and Analysis
### Comprehensive Level Measurement of Each System
#### 4.2.2 Analysis on the Spatial Evolution Trend of Coupling Coordination Degree  
In accordance with the division and deployment of China's coastal areas in the \"14 th Five-Year Plan\", the Northern Maritime Economic Circle (mainly including the sea and land areas of Tianjin, Hebei, Liaoning, and Shandong), the Eastern Maritime Economic Circle (including the sea and land areas of Shanghai, Jiangsu, and Zhejiang), and the Southern Maritime Economic Circle (including the sea and land areas of Guangdong, Guangxi,Hainan, and Fujian) were analyzed, and the spatial evolution trajectories of technological innovation and ecological environment development optimization in China's coastal areas were analyzed and spatially visualized. The specific dynamic evolution trajectories of technological innovation and ecological environment development in China's coastal areas over time are shown below.  
From the comparison of different periods in Figure 3, we can see the spatial evolution trajectory of the coordination between technological innovation and ecological environment development in coastal areas of the country. Among them, the degree of coupling and coordinated development shows a trajectory of gradually spreading from the eastern maritime economic circle to the north and south. From the perspective of the overall spatial pattern distribution, the distribution is \"high in the eastern marine economic zone and low in the north and south marine economic zones\", that is, a convex spatial pattern of \"high in the middle and low at both ends\". Specifically, in 2010, the coupling and coordinated development index in most coastal areas was in a barely coordinated state. However, Jiangsu and Guangdong have relatively high coupled coordinated development indexes and are in a primary coordination state. Guangdong and Jiangsu have always placed technological innovation and ecological coordination in prominent positions. In 2016, most of the coupling and coordinated development indicators in coastal areas were upgraded to primary coordination status, forming a spatial pattern of \"preliminary agglomeration\" with Guangdong and Jiangsu as the leaders. Jiangsu and Guangdong took the lead in reaching the intermediate level of coordination. In response to the call of the 13 th Five-Year Plan, Guangdong and Jiangsu took the lead in further improving their scientific and technological level and technological innovation capabilities and fully implementing the concept of green development. In 2020, the coupling coordination development index in coastal areas further improved, and a spatial pattern of agglomeration of coupling coordination degrees began to form. In the coastal areas, seven regions, including Hebei, Shanghai, Jiangsu, Zhejiang, Fujian, Shandong, and Guangdong, reached the intermediate level or above of coordination status, and most of them are from the Eastern Maritime Economic Circle and the Southern Economic Circle. Among them, Jiangsu and Guangzhou took the lead in entering a state of good coordination. Although Hainan has been optimizing coordination, the reason why it is still on the verge of imbalance is that Hainan relies on its superior location advantages to vigorously develop primary and tertiary industries, such as fruit agriculture and tourism, and constantly improve and optimize the ecological environment. However, the backwardness of the secondary industry makes its scientific and technological innovation capabilities insufficient and incompatible with its ecological level, which indicates that Hainan Province has massive room for future development.  
Figure 3: Spatial evolution distribution of coupling coordination degree between scientific and technological innovation and ecological environment development in coastal areas.