Abstract：Abstract：This paper takes the advantages of the scientific substances of the different rock classification methods and studies the characteristic of the sample distribution according to the different classification methods. With the sample distribution characteristic which increases the dependability of the classification，the statistics regulation and the synthetic regulation coordination were studied. According to the condition of Pingdingshan mining area，the overall classification for rock¢s stability was proposed on the basis of the three indices of the ground pressure coefficient，the loosen area，and the joint propagation¢s degree. The classification figure expresses the sample¢s distribution regulation. It increases classification dependability，and simplifies the classification method. The statistical criterion for appraising rock stability was obtained by studying the coal roadways in Pingdingshan mining area. A new kind of stability overall classification method was put forward. Based on roadway condition and measured information，the stability was evaluated and the multi-index rock classification figure was presented.
