Abstract: In this paper, theoretical investigation is shown for cuts and propagation directions on KNbO$-3$/, PKN substrates where the Bleustein-Gulyaev waves exist. The KNbO$-3$/ and PKN crystals Y-cut X-propagating relate to the condition in which the stiffened shear horizontal wave and pure mechanical Rayleigh wave are present. In this symmetry orientation the sagittal and transverse particle displacements also uncouple. In this situation, the potential is coupled to the shear horizontal displacements only. Electromechanical coupling coefficients K$+2$/ has a sufficiently large value of above 53 percent with a phase velocity of V $EQ 3.918 km/s for KNbO$-3$/ crystals and factor K$+2$/ has a large value of above 23.6 percent and phase velocity V $EQ 3.054 km/s for PKN crystals. !4
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