Using the theory of wave motion, the dynamical property of a piezoel ec tricelastic layered bar under longitudinal impulse loads at the free end was a n alyzed. The equations of wave propagation in the layered bar were established on the plane crosssection assumption. Displacement and electric potential expres s ions were obtained by solving the equations with Laplace transform. The relationship between the displacement and the electric potential and their propagation in th e bar were given. The influences of elastic modular and the thickness ratio of p iezoelectric layer and elastic layer on wave speed, displacement and electric po tential were discussed. The result shows that the electric potential distributes linearly along the thickness direction, and the velocity of longitudinal impuls e increases with the Young modulus and reduces with the increase of piezoelectri c layer thickness.