Nearly monodisperse CdS semiconductor nanocrystals have been successfully fabricated by a simple solvothermal route using cheap and low-cost normal inorganic compounds as precursors. The reaction temperature is demonstrated to be critical for the fabrication of the monodisperse nanocrystals. The nanocrystals were characterized by XRD, TEM, UV-vis absorption and photoluminescence spectra. Without involving special conditions, this method can be expected to make considerable contribution to the fabrication of various nanocrystals and nanocrystals-related research.