LaFeO3 nanofibers are successfully prepared by the electrospinning method. XRD patterns show that the materials belong to a cubic system. After calcination at 600 degrees C for 3 h, SEM photographs show that the diameters of the nanofibers are about 80-90 nm and their surfaces are smooth. The response-recovery properties of an LaFeO3 nanofiber sensor to ethanol are better than those of an LaFeO3 nanobelt and nanoparticle sensor. LaFeO3 nanofibers 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.