Finite element solution is presented for finitely long, simply-supported, orthotropic, piezoelectric shell panel under pressure and electrostatic excitation. The influence of the piezoelectric layers on the mechanical behavior of structures is studied. The direct piezoelectric effect of the piezoelectric material in ordinary (normal) and shear mode application are investigated. Numerical examples are presented for [0/90/P] laminations, where P indicates the piezoelectric layer. Piezoelectric layer can be completed or patch form. Finally the results are compared together and the shear mode advantages are discussed.