Thin films of lithium tetraborate (Li2B4O7) were obtained by the pyrosol process based on the pyrosolysis on a heated substrate of an aerosol produced by the ultrasonic spraying of a solution. The films exhibited some preferential crystalline orientations. The effect of various parameters such as the concentration of precursors in methyl alcohol, and the nature and temperature of the substrate were studied to control the morphology and the preferential orientation of the thin film.