In this thesis, the feasibility of inverse evaluation of piezoelectric parameters by using piezoelectric beam¡¦s natural frequencies is presented. Generally, all the piezoelectric parameters are not measured simultaneously. In other words, the interactive effects between the piezoelectricity and strain are not all included. The piezoelectric beam¡¦s natural frequencies are analyzed by the inverse evaluation of piezoelectric parameters associated with the optimization algorithm. The dynamic model for piezoelectric beam is proposed by using Hamilton¡¦s principle in this study. The corresponding eigenvalue problems of different piezoelectric beams are formulated and solved by employing differential quadrature method (DQM). The genetic optimization algorithm is employed to optimize all piezoelectric parameters from the measured natural frequencies. Optimization of piezoelectric parameters of piezoelectric beam under the boundary conditions of fix-fix ends and fix-free ends are investigated. The robustness of program is also demonstrated through several numerical examples. The results demonstrate the method of this study applied to determine piezoelectric parameters by using natural frequencies is feasible and practicable.