Piezo-composite plate consists of 1-3 type piezoelectrical pillars that are obliquely embedded in a viscoelastic soft polypropylene matrix. The finite element model (FEM) is developed to investigate the positive piezoelectrical properties and the energy dissipation characteristics of active piezoelectric composites. The strain vectors and shape functions of composite plate are derived by the displacement relations. The motion equations of element were obtained by using the Lagrange’s equation. The loss factor is expressed by the ratio of the dissipated of the stored energy. The effects of the sloping angle of the piezoelectric pillars on the positive piezoelectric properties are shown. The bending mode frequencies and deflections and the positive potentials are analyzed. The antisymmetrical potential is appeared along the width direct of composite plate under pressure. The loss factor of composite plate is presented for the effect the sloping angle of the piezoelectric pillars and the control gains considered. The results indicate that the loss factor attains the maximum at an angle of 57 for the different control gains and effectively high loss factors may be attained by proper selection of the design parameters of composite plate. Using the composite plate embedded sloping piezoelectric pillar, can decrease the brittleness of piezoelectrical plate and ensure the homogeneity as well as application of larger dimension piezoelectrical composite plate.