LaFeO3 nanofibers are successfully prepared by the electrospinning method. XRD patterns show that the materials belong to a cubic system. After calcination at 600 °C for 3 h, SEM photographs show that the diameters of the nanofibers are about 80?C90 nm and their surfaces are smooth. The response?Crecovery properties of an LaFeO3 nanofiber sensor to ethanol are better than those of an LaFeO3 nanobelt and nanoparticle sensor. LaFeO3nanofibers have relatively low resistance, and they improve the weakness of LaFeO3 nanoparticles upon application. An LaFeO3 nanofiber sensor also has good reversibility and selectivity to ethanol and is a very good p-type semiconductor material.