The phase diagram of the Sb2Se3-CuInSe2 pseudobinary system is constructed by using differential thermal analysis and X-ray diffraction. Based on the constructed phase diagram, solution growth of CuInSe2 crystals is investigated. The grown crystals are evaluated by X-ray diffraction, electron probe microanalysis, Hall effect and inductively coupled plasma measurements. The results indicate that the crystals are not contaminated by the constituent of the flux, i.e., Sb. Hence, Sb2Se3 is promising as a solvent for the growth of CuInSe2 crystals at temperatures lower than 800 degrees C.