In this work, we measure Seebeck coefficient with illuminating of light. Effect of photo-Seebeck on the wide-gap oxide CuFeO2 was investigated on the photo-induced carrier contribution for enhancing thermoelectric properties. In addition, the illumination light was considered the changes of the Seebeck coefficient. Blue, Red, Green and Violet LED were used for the photon energy of the illuminated light. The Seebeck coefficient from LED was compared to the results of white light and dark light. The mechanism of photo-Seebeck to enhance thermoelectric properties for CuFeO2 will be reported and discussed.