Abstract:The goaf left behind after ore mining is always a hidden danger to mine. The stability of goaf is related to mine production safety. In this paper, according to the actual situation of mine, 5 parameters which can best reflect the characteristics of goaf are selected as evaluation indexes. Based on the objectivity of the coefficient of variation method and the simple and efficient efficiency of the efficiency coefficient method, a stability discrimination model of the efficiency coefficient method for goaf was proposed, and the stability of 7 goaf in a mine was identified and compared with that of the numerical analysis method. Discriminant result of the calculation results show that the model and the results of numerical simulation, the proposed goaf stability discriminant method to calculate simply and quickly, can more accurately evaluate the stability of goaf, for provides a scientific basis for mining goaf management and stability evaluation, assessment method of underground mine safety production has good guidance.