Micron-sized rod-like crystals of Cu 2 - x Se were successfully grown for the first time by a hydrothermal reaction from CuCl 2 .2H 2 O and Se powder at 60 o C for 2h. X-ray powder diffraction patterns (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM) images, and transmission electron microscope (TEM) images show that the product is cubic Cu 2 - x Se rod-like crystal and well crystallized. Hydrazine hydrate was used as solvent in the process and played an important role in the formation of rod-like Cu 2 - x Se crystals. The optical properties of Cu 2 - x Se, such as absorption spectra, photoluminescence (PL) spectra, and Raman spectrum are also reported for the first time.