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- In this paper, the impedance of a piezoelectric transducer is calculated by using the three-dimensional finite element method. And tThe validity of numerical routine is confirmed experimentally. By uUsing this numerical routine, the effects of material coefficients on piezoelectric actuators characteristics, are analyzed. The material constants, which make significant effects, are selected and the relations between material constants are studied. By uUsing these processes, three variables of material constants for a piezoelectric transducer are selected and the design sensitivity method is adopted as an inversion scheme. The validity of the inversion scheme for a piezoelectric transducer is confirmed by applying the proposed method to the sample piezoelectric transducer.