and gas sensing thin film is fabricated via direct current sputtering.The influences of the annealing temperatures and the composition of the thin films on the sensitivity of gas are investigated.The experimental results show that the main composition of the thin film annealed at 600 ℃ is ZnSnO
3
the sensitivity of the thin film for ethanol measured at 450 ℃ is 650
ZnSnO
3
is a hopeful candidate material for ethanol sensor.