Abstract: In order to evaluate the stability of goaf in gypsum mine accurately that refers to many factors,13 indexes which affect the stability of goaf were selected,the evaluation methods for these indexes were discussed in this paper;based on the theory of set pair analysis,the set pair was constructed with measured values that influence the stability of goaf and the standard of the stability of goaf,the connection of the set pair was described by connection degree and the stability of goaf on gypsum mine was classified.A case study,the stability of the goaf on one gypsum mine was evaluated by this model.The results shows that the evaluation is right,the calculation is simple,the results of classification are feasible;opens up a new way for the stability evaluation of mined out area,and has reference meaning for other stability evaluation of rock.