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Composited nanoparticles, consisting of Mn(3)O(4), S-doped Mn(3)O(4) and 5, were synthesized by co-precipitation reaction and Mn(3)O(4) nanoparticles were then obtained after removing the pure S from the composited nanoparticles. The Mn(3)O(4)-type phase with larger lattice constant a was formed by doping sulfur. At fixed temperatures below Curie temperature (T(C)), the magnetization of the S-doped Mn(3)O(4)/S composited nanoparticles was smaller than that of the Mn(3)O(4) nanoparticles. The blocking temperature was 36.3 and 34.8 K for S-doped Mn(3)O(4)/S composite and Mn(3)O(4) nanoparticles, respectively. The anisotropy field of S-doped Mn(3)O(4)/S composite was determined to be about 55.3 kOe.