The dynamic model of the system is established based on the Hamilton principle where the bimorph is simplified into a 3-layer piezoelectric laminated beam according to the hypothesis of Euler beams. The analytical expressions of the output characteristics of the bimorph under different axial forces is derived from the solution of the partial differential equation and specific boundary conditions of the axial precompressed piezoelectric bimorph At the same time, the simulation is conducted to verify the correctness and gain the credibility of theoretical analysis. At last, the static and dynamic properties of bimorphs are studied experimentally. It is proved that the bending stiffness and natural frequency of the bimorph are reduced by the application of axial force. The electromechanical coupling efficiency is significantly increased and the output capability is improved. While the axial force affects the peak displacement of the bimorph at start-up, it has little effect on the response time and bandwidth. The bimorphs still have advantages over high bandwidth and fast response under large axial force.