Abstract: The dynamic stability of the high tailings dam has been paid more and more attention by the industry and the regulatory authorities，and some development has been achieved in recent ten years.Taking a high tailings dam to close your library as the research object，a finite element model of tailings dam for dynamic response analysisis is established by using Quake module of Geo-Studio software，and the dynamic stability of dam is simulated and analyzed. The minimum safety factor of dam and the dynamic results are calculated.The results show that the dam is safe ，which provides a theoretical basis for ensuring the safety for the dam closure，and can be used as a reference for similar projects.

Key words: high tailing dam, earthquake, dynamic stability, factor of safety, permanent deformation