Abstract. We prove two existence theorems, one for evolution quasi-variational inequalities and the other for a time-dependent quasi-variational inequality modeling the quasistatic problem of elastoplasticity with combined kinetic-isotropic hardening.Keywords and phrases. Evolution quasi-variational inequalities, coercive, weakly convergent, weakly continuous, weak topology. [12] have studied numerical solutions of quasivariational inequalities using techniques of nonsmooth optimization. The evolution quasi-variational inequality modeling the evolving shape of a growing pile has been studied by Prigozhin [13]. Han, Reddy, and Schroeder [5] have investigated a new class of evolution inequalities where rate quantities occur in all of its terms. An inequality of this type represents, for example, the quasi-static evolution of an elastoplastic body where the stress law is of the linear kinematic or isotropic hardening type. Such a variational inequality may be useful in the modeling of financial derivatives and option pricing, see Wilmott et al. [14]. In this paper, we discuss the existence of solutions of the implicit evolution quasi-variational inequalities. In Section 2, we present an existence theorem which is closely related to an open problem mentioned in [13]. The evolution quasi-variational inequality problem of the Han-Reddy-Schroeder type is considered in Section 3.