Based on the engineering geological characteristics and engineering construction experience in the main urban area of Qingdao City, the characteristics of rocks and soil mass, groundwater, geological structure and soft soil are comprehensively analyzed. The suitability of underground development in the main urban area is evaluated using fuzzy comprehensive evaluation, and the suitability of underground development in the main urban area is divided into suitable area, basic suitable area and poor suitable area. The zoning evaluation is also carried out. The results show that the suitable area accounts for 79% of the total area of the main urban area and is suitable for underground space development; the basic suitable area with general suitability accounts for 13% and reinforcement and waterproofing measures should be paid attention to in the development of underground space; the poor suitability accounts for 8% and should be avoided for further underground space development as much as possible.