Flower-like MoS2 nanoparticles have been synthesized through a mild solvothermal reaction with the aid of ethanol aqueous solution,and characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD) and low temperature nitrogen adsorption-desorption. The flower is composed of the ultra-thin nanosheets of 10 nm in thickness. The influence of the reaction temperature and the reaction time on the formation of the flowers was evaluated. The optimal experimental conditions were determined as follows:the molar ratio of 1∶1 between ethanol and water,reaction temperature of 190 ℃ and reaction time of 24 h.