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The expression of radiate power and bandwidth are presented by using the aquivalent circuit model of the longitudinal vibration transducer. At first, the design variable and its constraint condition are exerted based on the design and environment in which the transducer is used. The optimization mathematical model of Tonpilz transducer is built up. Design variables of the resonance frenquency of 30kHz are constrained, the members of the transducer are optimized By using genetic optimization process. Finally, the FEM analysis is performed according to the optimized parameters, the calculated results are compared and analyzed. It is shown that the maximum of radiated power is enhanced by one times after the optimization, and the bandwidth is kept in about 10kHz. The effect of the optimization is vertificated via the FEM method, the performance of the transducer is better after the optimization.