ZnO-based SAWCsurface acoustic wave) filters are fabricated with the configuration of IDT/ZnO/Si02/Si (100) using various IDT materials such as Al. Cu/Ti. and Cu/Al. Their frequency response characteristics are measured and compared. The thickness of Al IDT is varied to examine the mass loading effect. In addition, effects of thermal treatment and electrical stress on the frequency responses of the fabricated SAW filters are investigated