Abstract：At present，parameter selection for the stability calculation of perilous rock is just considering the aspects of mechanics. In general，the rock mass parameters are gained by a great deal of experiments and empirical formulae. Especially，the shear strength parameter of controlling structural plane in perilous rock is the key issues to its stability. Based on the analysis of stability influencing factor of perilous rock，combined with environment influencing factor on shear strength parameter，the back propagation(B-P) artificial neural network(ANN) method to calculate the synthetic shear strength parameter used in stability analysis of perilous rock is adopted；and the weakening coefficient of coupling parameter and parameters of controlling structural plane in perilous rock are achieved. By applying the coupling method to perilous rock project at Shoulishan，Wanzhou，the results show that the coupling parameters agree well with parameters deduced by typical equivalent method；and method is validated.
