Type 3-2 ceramic-air composites were developed to improve the structure of type 1-3 piezoelectric composites. Type 3-2 piezoelectric materials are composites of PZT-5A and air. In this study, the possible vibration patterns of a type 3-2 piezoelectric material were first investigated through modal analysis using the ANSYS finite element simulation software. Then, the steady state response of the sensitive element under sinusoidal signal excitation was analyzed based on the harmonic response. The effect of the ceramic volume percentage of the piezoelectric material on its vibrational characteristics was investigated, along with the variation of the vibrational displacement with frequency. Finally, a physical sample of a type 3-2 piezoelectric material was experimentally prepared, and the vibration condition of a piezoelectric oscillator was measured using a laser vibrometer to verify the simulation data. The results showed that under the excitation of a sinusoidal signal, the piezoelectric crystal column experienced length-stretching vibration, and the maximum value of the vibration displacement was 3.840 nm. Changing the ceramic volume occupancy ratio did not significantly affect the vibration displacement.