The dynamic triaxial tests for slope models similar materials（analog soft rock and weak interlayer）were conducted on shaking table to research their dynamic characteristics.The research results show as follows:under cyclic load

the elastic deformation of soft rock is rapid and at the load rollover spot

the hysteresis loops present sharp leaf shape

but the weak interlayer is opposite and presents elliptic shape.Dynamic elastic modulus of the two materials are larger than their static elastic modulus under each confining pressure

and the skeleton curves are similar to hyperbola and the curre 1/Ed-εdhas the better linear relation.With the increase of confining pressure

the similar material of soft rock shows strain hardening tendency

but the weak interlayer is opposite.The damping ratios of soft rock and weak interlayer increase with increase of dynamic stress.Under same stress state the damping ratio of the weak interlayer is 1.5to 5times that of soft rock.Corresponding to this

the dynamic responses and failure area of slope with thin interlayer are more vigorous than those of the thick interlayer.The research results could give references to nonlinear dynamic responses of slopes under severe earthquake.