Abstract：On the basis of evaluation on current analysis methods of anti-slide stability in rockmass engineering，their deficiency are pointed out. With the application of the friction theory and the vector geometry，the formula of anti-slide stability safety coefficient is presented based on the non-linear FEM analysis. According to the mechanics principle of engineering stability，the disturbing energy method of rockmass stability criterion is presented. In response to the stability problem of rockmass without conspicuous slide faces，based on quantitative disturbing energy criterion and static criterion，the quantitative criterion standards of the latent slide face and the most dangerous slide direction and the minimum stability safety coefficient are proposed and formulated. The stability criterion system is perfected on rockmass engineering. The mechanics foundations are laid for quantitative stability criterion on surrounding rock without conspicuous slide faces. The disturbing energy method may be used to determine the latent slide body and the possible slide direction，and the composite criterion of rock-mass stability is worked out by combining the static method. On the analysis of rockmass stability by the static method，the difficult problem of determining the slide face and the slide direction is solved. Moreover，the application results of the disturbing energy method and the static method may be used to check up each other，and the criterion system of rockmass stability is formed. The stability computations of surrounding rock in underground chambers and high dam abutment with height of 305 m are given for two engineering projects. According to the disturbing energy value and its isograph，the latent slide faces are determined. Estimating rockmass stability by the disturbing energy method and the static method，the numerical results indicate the rationality and the feasibility of the presented method.
