A simple casting film of Poly(6-[4-(4-cyanophenylazo)phenoxy] hexyl methacrylate) (PM6ABCN) was made on an untreated surface of a glass substrate and adopted as a typical sample to study photoinduced orientation of azobenzene liquid crystalline side chain homopolymers．Photoinduced orientation process of the sample was examined．A novel domain model was proposed to give a qualitative analysis of the photoinduced orientation below Tg．It was found that the experimental temperature had no effect on the rate of orientaion

and within the domain the temperature higher than Tg was resulted from radiationless decay of absorbed light energy

and the orientation behavior of microscopic domains was identical with that of the macroscopic sample above Tg. An apparent activation energy of the orientation above Tg was found to be 32.76 kJ／mol．It means that this orientation process has a lower temperature dependence than that of the thermal I-N phase transition (340.2 kJ／mol).