Abstract: Because mechanics character of slope rock mass and stability condition in opencast mine have obvious dynamic character, so it is very difficult to got reliable analysis results by tradition method. Therefore, according to the information of deformation monitoring of slope rock mass in this paper, the technique of slope stability analysis was put forward. In order to analyze dynamically slope stability, some deformation monitoring dots were firstly laid on the slope face. Then, the numeric analysis model which corresponding current exploit status was established based on fact exploit status of the Mine (height, angle and geological structure).and the equivalence parameters model of slope rock mass was identified, based on the least criterion of the difference between monitoring displacements and computation displacements. At last, the appraisement of current slope stability and the forecasting of futurity exploiting slope stability were discussed through analyze equivalent parameters. The applied research of the north side A-A cross section slope of Changba opencast mine was carried through based on the analysis technique which is put forward in this paper. The research results show that the technique can get close results with fact slope stability condition, and can provide a new analysis method for the stability analysis and safety appraisement of high and steep mine slope.