Bisslyrylanthracane derivatives with long alkyl side chains (BSA), which. were prepared into the thin films composed of giant anisotropic domains by simple melt process, showed interesting property. The derivatives that changed. the Maims length a,and chains form were synthesized. We introduced, the film. preparation and investigated thermal properties of the films using differential scanning calorimetry (DSC), polarization micrograph, and fourier transform,infrared spectroscopy (FT-IR). The phenomena, of the giant. domain formation and phase transition in BSA films ore discussed.