Dielectric and thermal characterizations were performed for poly(vinylidene fluoride) (PVDF)/poly(ethyl methacrylate) (PEMA) blends of different composition. The characteristics of PVDF beta relaxation were shown to be little affected in the semicrystalline blends with PEMA. The relaxation strength, however, depends strongly on the PEMA content and a linear relation was found between the intensity of the beta relaxation and the weight fraction of the PVDF crystal-amorphous interphase. Phase structures of the PVDF/PEMA blends are also proposed.