Temperature effects on the electro-optic properties for the PDLC films of PMMA/E7 blend prepared with and without pre-aligned LC droplets within the blends were investigated. The observations of the electro-optic response times with temperature fort the films led to a result that there is an effective interfacial region between the polymer matrix and bulk LC-rich droplets, having a thickness with LC concentration gradient i.e., from lower LC concentration of matrix-side to the higher one of LC droplet-side. It was also considered that the thickness of this interfacial region could be changed depending on temperature. In the effective interfacial region, moreover, the polymer chains of matrix-side can affect the LC relaxation motions of droplet-side, by relaxing their own stresses exerted by electric field on cooling the PDLC film with AC field, exhibiting two different relaxation processes of title film at a fixed temperature, i.e., the fast relaxation and the slow one.