Therefore, there is very good application resource, and the solar radiation energy to the earth surface is about 10,000 times of various kinds of energy consumed in the world at present; and cheap renewable energy sources, and the solar drying process has no pollution to the drying products; drying system generally suitable for low temperature. The thermal energy density of solar energy is low, and the heated air temperature rise is limited. Unless you use the special heat collector to collect heat, it can greatly enhance the temperature; energy is the interrupted energy. Influenced by the weather, the night and cloudy day fails to use, the daytime is also affected by solar radiation strength, which will influence the drying speed. However, the solar heat storage device has great improvement role in the aspect.