Abstract:The matter element model of cavern rock quality evaluation is established using matter element model theory based on extension engineering method. The stratification analysis method used to calculate weight aggregation of evaluating factors is proposed. Through calculating the relational degree of the actual cavern rock quality grades,the rock quality of Shuibuya Waterpower Station cavern is evaluated by extenics,and the conclusion has good relation with the facts. It is shown that stratification analysis method is feasible to calculate the weight aggregation of evaluating factors. The extenics evaluation of cavern rock quality with high applicability can more precisely reflect the quality classification of the cavern rock.