The spray tempering process is theoretically more energyefficient than the aircooled tempering process. In order to investigate the actual energysaving effect of the spray tempering process, the plate glass with dimension of 40 mm×40 mm×5 mm were used for aircooled tempering and spray tempering tests. The results show that compared with aircooled tempering process, the spray tempering process saves at least 25.06% energy during cooling. The spray tempering process improves the tempering degree of glass, that is, the particle number of broken increases by at least 8.91%, the surface compressive stress increases by at least 12.12%. With the increase of mist load fraction, the cooling time decreases, and the energy saving effect and tempering degree increase.