Abstract: To select the appropriate mining methods for the areas of Jiaojia Gold Mine, the stability of rock mass was classified.To overcome the one-sidedness of traditional methods, the method of combining Analytic Hierarchy Process with Fuzzy Comprehensive Evalution was selected.Taking the -270 m middle part of Jiaojia Gold Mine for example, all the influencing factors were fully considered to establish the comprehensive evaluation index system.And the weight vector of all index factors was determined according to the Analytic Hierarchy Process and the membership matrix was established by the principles and methods of fuzzy mathematics.The comprehensive evaluation vectors of rock mass stability determined by fuzzy comprehensive evaluation were （0.052 1, 0.556 2, 0.246 9, 0.135 4, 0.009 4）.It is seen that the rock mass of this part is relatively stable, which is in accord with the actual investigation.

Key words: Rock mass stability, Membership function, AHP, Fuzzy comprehensive evaluation