Abstract: Tailing pond is a great dangerous source of man-made mud-rock flow with high potential energy.Tailings dam-break accident will result in huge impact and destruction when it happens.In order to make emergency hedge plan timely and effectively at the limited time of emergency disposal to reduce the casualties，economic losses，and destruction of ecological environment caused by dam collapse，the slip range the buried tailing area after dam-break need to be correctly estimated，that is，mainly determining the slip distance of dam landslide.In view of the sliding distance estimation of dam-break landslide of tailings，two kinds of sliding model，the rigid sliding along the fold surface model and the rigid sliding along the circular arc surface model，are introduced，and their calculation formulas for dam landslide slip distance are set up.Several main problems related to the landslide of tailings dam-break including diffusion angle，aeration depth，air resistance，slip body height，residual strength，impact several main problems of dynamic pressure and dam are discussed.Through calculation，the results of the both sliding models approach to the actual situation.The two models can provide the reference for the safety management as well as the location of the tailings.

Key words: Tailings dam, Dam-break, Sliding model, Slip distance