Abstract: Scientific and reasonable evaluation of urban underground space resources is an important basis for effectively utilizing underground space resources and preparing underground space planning.Based on the geological conditions of the development and utilization of underground space resources, this paper constructs an evaluation system of geological suitability of underground space resources based on conventional factors and sensitive factors, quantifies the index system, uses the entropy weight method to quantify the index weight, and uses AHP to optimize the entropy weight method.On this basis, the multi-objective linear weighting function method and the most unfavorable grade discrimination method are used to evaluate the geological suitability of underground space, and the Nanshan District of Shenzhen is taken as an example to evaluate the underground space resources.The evaluation results show that 47.81% of the areas with good suitability of underground space resources in Nanshan District of Shenzhen, 43.63% of areas with general suitability, only1.92% of areas with poor suitability, and 3.30% of areas with prohibited construction.The evaluation results can provide some reference for the underground space planning in Nanshan District, Shenzhen.The evaluation model and weight determination method in this paper have certain reference significance for the geological suitability evaluation of underground space resources in the future.