## 1 Introduction  
In recent years, China's urbanization process has been accelerating, and the urbanization rate has increased from 49.95% in 2010 to 60.6% in 2019. However, the separation of industrial development and urban construction has become more serious at the same time, resulting in a series of urban problems to be solved urgently. If the development of industry lacks the supporting role of the city, it will cause urban diseases such as home-work separation, traffic congestion, and environmental pollution [1, 2, 3]. In the end, it will only lead to the urban area evolving into an industrial zone, becoming a \"sleeping city\" or even a \"ghost city\" [4]. If the urban development loses the driving role of the industry, it will lead to problems such as industry hollowing-out, insufficient stamina of urban development, and decline in residents' living standards [5, 6]. As a result, the Chinese government has gradually realized the problem of urban construction and thus put forward the strategic goal of \"city-industry integration\". In 2014, the State Council issued _the National New Urbanization Plan (2014-2020)_, which takes \"city-industry integration\" as the leading idea for the development of new urbanization. This idea takes the city as the carrier to develop the industrial economy, and takes industry as the guarantee for the promotion of urban renewal, so as to achieve a high-quality development model [7]. To achieve the integration of industry and city, the basic role of traditional theories [8] and the promotion of innovative theories are very important. The way in which to meet the inherent requirements of matching industrial space and social space is the core issue in terms of promoting the realization of China's new urbanization construction goals. With the emergence of new topics in urban development such as innovation-driven approaches and replacing old growth drivers with new ones, the exploration of city-industry integration under the new situation should be further deepened [9]. Under the severe situation of fundamental changes in the speed, structure, and driving force of economic development, it is of great significance to evaluate the development level of city-industry integration, as well as its spatial differentiation [10]. This paper sorts out the main influencing factors discussed by scholars and comprehensively evaluates the development level from the six aspects of industry, city, people, service, ecology, and science. This part includes three steps: (1) establishing an index system with the support of a big data index database, (2) combining PSO-AHP and EM to build a new empowerment method, and (3) improving TOPSIS with GRA to obtain a multi-attribute decision-making method. At the same time, the Gini coefficient and Theil index are introduced to measure the regional difference of city-industry integration development. This paper focuses on the balanced development of city-industry integration, which plays a key role in realizing high-quality urbanization. This is particularly the case for Sichuan, a southwest province with unbalanced and insufficient development [11]. The research on city-industry integration in Sichuan Province is mostly focused on the problems and development paths of a specific city or industrial agglomeration area [11; 12; 13]. There are few quantitative evaluations of city-industry integration, and only [PERSON] [14] has conducted a relevant analysis based on the coupling coordination degree approach. Thus, the existing studies have not fully explored the indicators and methods for assessing the city-industry integration in Sichuan, and further quantitative analysis is needed to evaluate the region. The following are the novelties: (1) Establishing a comprehensive index system of city-industry integration with the help of big data. The main tool is a browser automation framework named Selenium. (2) Analyzing the development level of city-industry integration with a comprehensive method, including PSO-AHP, EM, and GRA-TOPSIS.