## 1 Introduction  
With the development of society and the acceleration of urbanization, there are many problems in cities, such as dense buildings, traffic congestion, and crowded living space, so the need for underground urban development is becoming more and more urgent. The development and utilization of urban underground space in foreign countries are early, and the achievements are high in developed countries such as Japan, the United States, and Europe [1]. In recent years, with the deepening of reform and opening up and the rapid development of economic and social development, China's urban construction is in a period of rapid development, and the 21 st century is also the heyday of China's urban transportation construction. Therefore, a more scientific, rational, and efficient approach has been identified as the development direction for the development and utilization of underground space resources in China [2, 3, 4]. For the evaluation of underground space suitability, many scholars have evaluated underground space resources in different cities. To assess the impact of underground space development on urban compactness, [PERSON] [5] chose a comprehensive compactness formula to determine the influencing factors based on the examples of Futian Station in Shenzhen and Tokyo Station and investigated the interaction mechanism between underground space utilization and urban compactness development. [PERSON] [6] selected several candidates for influencing factors on two underground lines in Osaka, Japan, and investigated the quantitative relationship between the influencing factors and the distribution of urban underground space around underground stations. [PERSON] [7] investigated the geological and urban planning conditions in Tangshan City and, based on this, proposed the concept of underground space development and selected the storage and utilization of underground space waste according to local conditions. [PERSON] [8] presented a three-dimensional geological and geotechnical model of the subsoil of Turin City. The model is managed through a geographic information system (GIS) and provides a more intuitive and scientific basis for planning and managing the underground space resources of Turin and subsequent decisions on construction plans. [PERSON] [9] established a systematic evaluation index system for the first time in the planning of underground space in Singapore, taking into account geological, hydrological, and environmental conditions, as well as social, political, economic, and other factors. There are currently many evaluation methods for urban underground space development, and the more mature ones applied are the fuzzy mathematical method [10], hierarchical analysis (AHP) [11], the expert scoring method [12], rough set theory and conditional entropy [13] and the grey assessment method [14], or a combination or improvement of two or more of these methods before using them [15; 16; 17; 18; 19; 20]. In this paper, it is not practical to use an accurate deterministic model to find the weights of evaluation factors because there are many influencing factors involved in the development and use of underground space resources, and each evaluation factor has different attributes, metrics, qualitative and quantitative criteria, and the complexity and multi-level nature of the evaluation factors. Based on the above analysis, this paper adopts the combination of the expert scoring method and hierarchical analysis method, using the expert scoring method to determine the evaluation factors, writing a fuzzy C-mean clustering algorithm through python, processing the data, and finally importing it into GIS for visualization to realize the suitability evaluation of the study area. As a key development city in Shandong Province, Weihai City has seen a rapid expansion of its urban area along with rapid development, and the city's living space environment has become increasingly harsh, with conflicts such as traffic congestion, lack of energy and water pollution, to solve many of these problems.