Slope stability analysis is an uncertain problem with randomness and puzzle. Using the analysis method of main compositions this paper preferentially selected the characteristic indicators affecting rocky slope stability so as to construct the characteristic parameters for slope stability modes and identify the membership functions of the slope, and establish the calculation method and the fuzzy identification model of slope stability. By adopting Delphi (Delphi method), the calculation results became more reasonable, and the results of recognition obtained by the transfer coefficient method are consistent with the results obtained under natural and rainstorm conditions, fully suggesting the strong practicability of the model for identification of slope stability.