Poly(vinylidene fluoride) (PVDF)/polyamide 12 (PA12) blends showed new peaks in XRD profile with increasing PA12 and the crystallinity of PA12 significantly decreased with the addition of PVDF. PVDF showed three relaxation regions at; about -40, 40, and 100 degrees C, respectively, and glass transition temperature (T-g) of pA12 increased in blends (10.8-->30.14 degrees C) and a-relaxation of PVDF decreased from 100.26 to 86.46 degrees C. Complex viscosities (eta*) vs. composition curve showed a great positive deviation in PVDF-rich and a small negative deviation in PA12-rich blends. The N-H and C=O stretching band of PA12 shifted slightly toward higher wavelength, and from curve-fitted data the area of hydrogen-bonded C=O stretching bands of pA12 decreased with the addition of PVDF, especially in the 30/70 blend, implying the existence of interactions between the beta-hydrogen atom of PVDF and amide carbonyl group of PA12 in the blends.