Perovskite-type La-0. (67) Ba-0. (33) MnO3 micro/nanofibers were fabricated through electrospinning technology. The fibers were characterized by means of differential scanning calorimetry-thermogravimetric analysis( DSC-TGA ), X-ray diffraction( XRD ), Fourier transform infrared spectroscopy( FTIR ) and scanning electron microscopy( SEM ). The infrared emissivity of the fibers in the temperature range of 280-370 K was tested by IR-2 infrared. emissivity analyzer. The results show that perovskite structure is formed at 600 degrees C. As the temperature increases, the morphology of samples changes from fiber to three. dimensional network structure, and eventually loses the fiber morphology. The infrared emissivity of La-0. (67) Ba-0. (33) MnO3 fibers calcined at 600 degrees C rises from 0. 564 to 0. 689 with the increase of temperature, which can be explained by the theory of double. exchange. The prospect of La-0. (67) Ba-0. (33) MnO3 fibers in variable infrared. emissivity materials is promising in the future.