In order to objectively evaluate the stability of tailings dam，under the framework of dynamic stability analysis theory and limit equilibrium analysis，monte carlo sampling technique was used to generate input parameter samples，and the characteristic values of input parameters were assigned to the tailing dam stability finite element analysis model respectively.The finite element software is directly called as the black box to carry out the integrated finite element batch analysis of the slope stability of tailings dam.The dynamic finite element method is used to reflect the dynamic characteristics of tailings dam better than the traditional quasi-static method.Tailings dam is applied to actual engineering is given to prove the effectiveness of the method，the results show that this method can truly simulate seismic action effect on the stability of tailings dam，and using monte carlo method to calculate 10000 times，it is concluded that the tailings dam failure probability，the method is simple and practical and has high computing efficiency， the downstream of the tailings dam safety， protecting life and property safety and the surrounding environment has important significance.