We investigated whether it is possible to observe piezoelectric resonance in Pb(Zr, Ti)$O_3$(PZT) thin film by pulse resonance method. We observed piezoelectric resonance in bulk PZT in non-contact state by pulse method. We studied in bulk PZT by continuous method the various boundary conditions similar to thin film. We observed piezoelectric resonance of bulk PZT when it was stuck to the substrate. When the electrode size is smaller than the sample we found that resonance frequency depend on sample size and not on electrode size. In PZT thin film of 0.5 ㎛ thickness and substrate thickness 0.5 mm, and upper electrode diameter 0.5 mm and sample size 2cm × 1cm piezoelectric resonance mode was not observed and the discussions are given.
