Abstract: In view of the frequent occurrence of geological disasters in tailing dams in recent years, it is necessary to analyze the stable state of tailing dam.The stability of tailing dams was analyzed by carrying out the overload safety analysis of inclined lifting of tailing dams.The numerical analysis model of strength reduction method was established and the accuracy of the results of inclined lifting overloading test was verified by the criterion of ultimate strain.The results show that the failure and instability of the tilting uplift overload of the tailing dam is the evolution process from the point failure at the initial dam foot to the overall instability failure; the monitoring results show that the displacement of the initial dam is larger than that of the subdam, and the displacement of the dam foundation is the smallest, the overload safety of the test tailing dam ranges from 1.35 to 1.38; the results of overload safety test and strength reduction basically coincide in safety factor and failure mode.The inclined lifting overload test method is suitable for the stability study of tailing dam.The research results can provide guidance for the construction, operation and prevention of geological hazards of tailing dam.