This paper describes the photoalignment behavior of liquid crystals (LCs) on a photoalignment layer containing a new photosensitive polyamic-ester derivative (PAE) under several fabricating conditions. Irradiating PAE films with a linearly polarized (LP) UV light at temperatures over 160 degrees C dramatically accelerated the photoreaction and photoinduced optical anisotropy. Furthermore, an improvement of the LC alignment quality was observed on PAE films when films were irradiated over 160 degrees C.