Abstract：In this paper, a L-T model of layered magnetoelectric composite materials is presented, which, based on piezoelectric effect and piezomagnetic effect constitutive equation, using the method of equivalent scheme, is used to analyze the magneto-ionic voltage coefficient of the composite materials, and to obtain various relations among physical parameters of the composite materials. Then a numerical computation is made of the materials magnetoelectricity response, and results are compared with those of interrelated finite-element experiments to obtain the magnetoelectricity response simulation result and the mechanical coupling in a composite where a magnetostrictive component is laminated with a piezoelectric one to achieve a giant magnetoelectric effect. It is shown that the direction of the applied magnetic field and the restriction upon the laminated composite affect the magnetoelectric coefficient markedly. It is found that the magnetoelectric voltage coefficient in the static method is quite close to that in the equivalent circuit approach, and it increases with the increase of the magnetostricive/piezoelectric thickness ratio. So a clear relationship is found between voltage and magnetic intensity, which provides a theoretical tool for the preparation and optimization of magnetoelectric materials. A new technology is developed in the field, for the environmental energy harvesting with the composite materials. Based on the simulation results, more studies will be carried out on using magneto electric materials as sensors.