## 4 Case Study
### Data Acquisition and Result
#### 4.2.2 Result of the Development of City-Industry Integration  
1. Overall results and discussion of city-industry integration. Sorting the level of city-industry integration in 18 prefecture-level cities in Sichuan Province can clearly reflect the changes of city-industry integration. As shown in Table 5, with the socio-economic development, the level of city-industry integration development in the 18 cities showed a relative upward trend during the decade. According to the GRATOPIS evaluation principle, the closer it is to one, the higher the degree of city-industry integration. However, except for Chengdu, the degree of city-industry integration was less than 0.5, which indicates that the overall level of city-industry integration in Sichuan is not high, and there is still much room for improvement. As the capital city of Sichuan Province, Chengdu's development level has always been significantly higher than other cities. However, its index has been rising more slowly, which is related to its need to drive the whole Chengdu Plain Economic Zone. Moreover, with the construction of the Chengdu Metropolitan Area, Chengdu will further exert its influence on Devang, Meishan, and Ziyang. Mianyang is the China Science and Technology City, its development level is stable at the forefront, and it was successfully selected as a national demonstration zone for city-industry integration in 2016. However, its city-industry integration has slightly decreased from 2018, which is related to the business environment reform in the Hi-tech Zone from the second half of 2017. Therefore, there is a reverse change in the values of some indicators of urban construction as well as ecology and environment in Mianyang. Panzhihua, famous for its secondary industry, has been steadily ranked in the top five, while scientific and technological innovation has developed rapidly. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Criteria Layer** & **Indicators \({}^{\ast}\)** & **PSO-AHP** & **EM** &
\begin{tabular}{c} **Comprehensive** \\ **Weight** \\ \end{tabular} \\ \hline \multirow{4}{*}{Economy and industry} & PG & 0.0964 & 0.0231 & 0.0598 \\  & PSOVG & 0.0387 & 0.0104 & 0.0245 \\  & PTOVG & 0.0791 & 0.0181 & 0.0486 \\  & GIOVEAS & 0.0519 & 0.0340 & 0.0430 \\ \hline \multirow{4}{*}{Habitat and employment} & HDB & 0.0452 & 0.0802 & 0.0627 \\  & PES & 0.0298 & 0.0107 & 0.0202 \\  & PUTP & 0.0676 & 0.0221 & 0.0449 \\  & PCHA & 0.0517 & 0.0111 & 0.0314 \\ \hline \multirow{4}{*}{Social services} & NB & 0.0419 & 0.0285 & 0.0352 \\  & NA & 0.0208 & 0.0391 & 0.0300 \\  & CSME & 0.0671 & 0.0680 & 0.0676 \\  & NS & 0.0383 & 0.0201 & 0.0292 \\ \hline \multirow{4}{*}{Urban construction} & IFAC & 0.0598 & 0.0947 & 0.0773 \\  & PII & 0.0180 & 0.0134 & 0.0157 \\  & PBF & 0.0324 & 0.0552 & 0.0438 \\  & PURA & 0.0548 & 0.0095 & 0.0322 \\ \hline \multirow{4}{*}{Ecology and environment} & EEA & 0.0546 & 0.0271 & 0.0408 \\  & CURISW & 0.0203 & 0.0054 & 0.0128 \\ \cline{1-1}  & WD & 0.0143 & 0.0139 & 0.0141 \\ \cline{1-1}  & RBECPG & 0.0436 & 0.0196 & 0.0316 \\ \hline \multirow{4}{*}{Science and technology} & NP & 0.0072 & 0.0382 & 0.0227 \\  & SEAPUFE & 0.0277 & 0.0270 & 0.0283 \\ \cline{1-1}  & RDII & 0.0145 & 0.0614 & 0.0379 \\ \cline{1-1}  & AG & 0.0123 & 0.1718 & 0.0921 \\ \cline{1-1}  & FERDP & 0.0119 & 0.0975 & 0.0547 \\ \hline \hline \end{tabular} \({}^{\ast}\)The indicators are expressed in abbreviations.  
\end{table} 
Table 4: Evaluation index weights in 2019. Bazhong is backward due to its geographical location in remote mountainous areas, unclear advantageous industries, and low scientific level. However, the degree of city-industry integration has risen from 0.3414 to 0.3643, and the ranking has also risen from 18 to 13. This means that Bazhong, located in the geometric center of Chengdu, Chongqing, and Xi'an, relies on its regional advantages to promote its stable development in all aspects.