Piezoelectric materials generate an electric field when they are subjected to strain fields and they deform when an electric field is applied. This phenomenon is widely uitilized in many devices, for example, sensors and actuators, micro-electro-mechanical systems (MEMS), transducers [
]. An analysis of piezoelectric devices requires a solution of coupled mechanical and electrical partial differential equations. In this paper the boundary element method (BEM) is implemented to solve the coupled field problem in piezoelectrics. The method allows the analysis by discretization of the boundary only. The piezoelectric material is modelled as two-dimensional: homogenous, transversal isotropic, linear elastic and dielectric [
]. The numerical solution by the BEM requires fundamental solutions, which have very complicated forms even for a simplified transversal isotropic model of piezoelectric material [
]. In the present work the Stroh formalism is used to obtain fundamental solutions [
]. In many applications piezoelectrics are connected with other materials: conductors, dielectrics and also other piezoelectrics. To analyze this problem the subregion boundary element technique is implemented [
]. Special boundary conditions must be applied on the interfaces, between different materials. The computer code is developed for several connected piezoelectric materials. The connection with other nonpiezoelectric materials is obtained by assuming particular material properties. The following connections are considered: piezoelectric — piezoelectric, piezoelectric — dielectric (for example a typical composite) and piezoelectric — conductor. Numerical examples will be presented and they will show that the subregion boundary element formulation allows to analyze efficiently multimaterial piezoelectric structures.