Abstract: Liquid phase epitaxy and magneto-optic properties of the films of (BiTm)₃(FeGa)₅O₁₅ are described in this paper. The influence of epitaxy on the growth rate and the magneto-optic properties of the films was studied. The high magneto-optic figure of merit, θ_F/α, of 2.9 deg dB has been obtained. The magnetic domain structures and the defects of the films were observed. We have conducted an experiment of modulation for low frequency on the magneto-optic modulator with fairly good results.