Piezocomposite materials provides effective properties (elastic, piezoelectric, and di- electric) that produce a better performance than pure piezoelectric materials. In the optimization of a piezocomposite the objective is to obtain an improvement in its perfor- mance characteristics, usually by changing the volume fractions of constituent materials, its properties, shape of inclusions, and the mechanical properties of the polymer matrix in the composite unit cell. An interesting application for piezoelectric materials are energy harvesting devices which stores energy from the environment. This work presents designs of functionally graded piezocomposite materials using topology optimization and homoge- nization method in order to maximize the electromechanical coupling coefficient k and the mechanical-to-electrical energy conversion, aiming at energy harvesting applications. The Functionally Graded Material (FGM) concept is applied to reduce the stress concentration between the constitutive materials and to investigate the influence of material gradation. The homogenization method is implemented using the graded finite element concept which takes into account the continuous gradation inside the finite elements. The material model used is based on the SIMP (Solid Isotropic Material With Penalization) and the optimiza- tion problem is solved by using the MMA (Method of Moving Asymptotes) algorithm.