Hollow nanospheres of molybdenum disulfide have been synthesized by a novel solvothermal method under low temperature (180 degrees C). These nanomaterials were characterized by X-ray diffraction (XRD), Fourier transformation infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM, HRTEM) and X-ray Photoelectron Spectroscopy (XPS). A mechanism for the synthesis reaction is tentatively proposed and discussed.