Abstract KxWO3,NayWO3 and KxNayWO3 crystals were prepared by fused salt electrolysis. The X-ray diffraction, Raman, Infra-red we may conclude and condutivity me. asurements were made. From our results that KxNayWO3 is formed by intercalating Na+ ions into the tetragonal KxWO3 crystal lattice. A mechanism of ionic conduction is suggested.