Abstract: Utilization of concentrator photovoltaic (CPV) can reduce market investment cost and shorten payback time because that CPV have high photoelectric conversion efficiency and the expensive solar cells are replaced by cheap solar concentrators. As the result of the solar cells’ fixed band-gap, solar cells can only convert photon energy close to the semiconductor band-gap to electricity. Photon energy both higher and lower than the semiconductor band-gap is converted to heat and lead to severe heat load, which greatly reduces photoelectric conversion efficiency and solar cells life. The spectral splitting technology directs the photon energy close to the semiconductor band-gap to solar cells and directs photon energy both higher and lower than the semiconductor band-gap to thermal absorbers, which offers a possibility for reducing solar cells temperature, increasing photoelectric conversion efficiency and solar cells life. Herein, starting from the wavelength band and energy grade of solar energy, taking the principle of customer demands for electricity and heat cogeneration, the spectral splitting technology based on nanofluids, interference nano-thin film and semitransparent PV cell were theoretically and experimentally analysed, respectively.