Abstract: This paper studied the suitability evaluation of the underground space development and utilization of coal mine and put forward the evaluation method based on fuzzy mathematics, which provided fresh ideas for coal mine enterprises and resource-exhausted cities. An evaluation index system, including 5 categories (space resources, stability factors, safety factors, space environmental factors, and economic factors) and 20 small evaluation indexes, was established. Then determine the rating standards for each index in the system and the weight of the evaluation index. Finally use the fuzzy mathematics theory for comprehensive evaluation. The study took Baiyuan coal mine in Pingxiang city as an example to evaluate the suitability and got a suitable evaluating result.