Abstract: In this paper,the two-dimensional seimic response analysis of tailing dam has been carried out for sixty case includingdifferent height and stiffiness of dam,and various input ground motions and peak accelerations,By the statistical analysis asimplified formula for calculating amplification of acceleration is given. Because a recommened value of the shear stress reductioncoefficient in the soil has been presented,it is simple to calcalate seismic shear stress. Based on the above results,Seed’s methodfor evaluating liquefaction is modified and a new simplified procedure for evaluating liquefection potential of tailing dam is proposed.