Piezoelectric cantilever bimorph vibrator is the core component of piezoelectric inertial actuators .Piezoe-lectric cantilever bimorph vibrator with lumped mass at the end is studied ,and a dynamic model is constructed by the proposed method of transforming symmetric electrical signal excitation to equivalent harmonic force excitation . Combining the theory and test ,the single-degree-of-freedom damp vibration system consisting of the vibrator is an-alyzed and the full response is provided .Dynamical system modeling and simulation are conducted by software Matlab/Simulink .The output response of deflection ,velocity ,acceleration ,driving force are solved using the in-put signal of equivalent harmonic force .Based on the data of theory ,simulation and experiments ,the deflection of vibrator is analyzed and compared under the excitation of sine wave signal .Result shows that the dynamic deflec-tion results of vibrator from theory ,simulation and experiments agree well with each other .The proposed model-ing and analysis approaches of the single-degree-of-freedom damp vibration system consisting of the vibrator ,have some reference significance for further research of piezoelectric inertial actuators .