Abstract: To obtain the scientific and reasonable weights of old goaf stability assessment indexes, a method based on fuzzy group decision-making is proposed. Firstly, the linguistic labels of fuzzy weights were defined, and the linguistic values of fuzzy weights about assessment indexes were offered by expert group according their knowledge; secondly, integrated all views of the experts, the linguistic values were transform into triangular fuzzy numbers, and the crisp values of fuzzy weights were received through defuzzification operation; finally, the weight values of old goaf stability assessment factors were determined in normalization process.