It is presented singular approximation of the method of periodic components for calculation tensors of effective elastic and electric properties of piezocomposites with irregular structures. Analysis of influence of inversion of polarization in the piezoactivity piezoelectric phases: matrixes from ceramic PZT-4 and oriented inclusions from polymeric PVF at the effective transversal-isotropic elastic and electric properties of composite with random structure is given. The new effects are determinates, which are conditioned by inversion of polarization in the inclusions.