Abstract: The effects of volume fraction of piezoelectric phase, and elastic modulus and Poisson's ratio of polymer on the piezoelectric properties of 1-3 type piezoelectric ceramic composite were simulated by finite element software, and the simulation was verified by experiments. The results show that the electromechanical coupling coefficient of the composite was relatively high and changed little when the volume fraction of the piezoelectric phase was 30%-85%. With increasing elastic modulus and Poisson's ratio of polymer, the series connection resonance frequency of the composite increased, and the electromechanical coupling coefficient decreased. The finite element model could accurately simulate the series connection resonance frequency and electromechanical coupling coefficient of the relatively hard polymer filled composites, and the relative error was less than 5%. The model was not suitable for the simulation of the electromechanical coupling coefficient of the relatively soft polymer filled composites.