The X-ray diffraction (XRD), magnetic susceptibility and electron spin resonance (ESR) measurements have been carried out for Na x C 60 . The XRD profiles with x<4 can be assigned to a face-centered cubic (fcc) lattice, while those with 4≦x to a hexagonal one. The temperature dependence of magnetic susceptibility χ for Na x C 60 using SQUID was fitted to the Curie law, and estimated temperature-independent component χ 0 . The composition x dependence of the χ 0 for Na x C 60 shows two maxima at around x=3 and x=10, and minimum at x=6. The absence of Pauli contribution at x=6 was confirmed using ESR. A trace of superconducting transition at 14K has been found for some Na x C 60 specimens with 8<x<9.