In light of the existing conditions of the orebody and the characteristics of the mining technology in the north rim mining area of Fenshen Copper Mine and by synthesizing the domestic and foreign stability classification system of ore/rock mass, this paper puts forward a parameter system including such 5 parameters as rock quality designation (RQD), uniaxial compressive strength, perfection coefficient of rock mass, joint spacing and joint behavior for assessing the stability of the ore/rock mass in the mining area, and carries out the synthetic stability classification of the ore/rock by grey fixed weight cluster analysis. The classification results are suitable for the practical engineering.