Abstract: he effects of properties of piezoelectric ceramics and implantation position on hearing threshold change
were studied. The experimental results show that the larger electromechancial coupling coefficient and electric capacity of implantation piezo-ceramics are,
the more obviously hearing threshold descends. And the successful probability is the highest while the ceramic sheet is stocked on the inside surface of
cochlear nerve of spiral limbus in the scala tympani. The results fully confirm the new idea is successful that piezoelectric ceramics cochlear
implant can simulate hair cell to do acoustic-electric transition, simulate auditory nerve to evoke the sense of hearing and improve the deaf ear’s
hearing.

Key words: cochleax, piezoelectric ceramics, implantation, hearing threshold, guinea pig