Abstract: Choosing nine factors of influencing the stability of surrounding rock and probing into the factors of the improved hierarchy gray clustering ore rock classification model are to improve the stability of the genesis of Analytic Hierarchy Process,to determine each index synthesis weights，and application of grey clustering theory according to the stability of the final judgment.And applying them to the actual engineering practice of mining.The results showed that this method of the conclusion of the classification is consistent with other common classification method when analyzed and compared with the ore-rock of other tradiptional grading methods at the same time，which provide a feasible approaches and practical new ideas for mine rock classification.

Key words: Engineering rock mass stability, Improved analytic hierarchy process, Grey cluster theory, Whitenization weight function