In recent decade, because of the influence of energy and environmental factor, the research in solar drying technology in China obtains rapid development, and the drying field is also enlarged, including the drying of conventional agricultural products like grain, fruit and vegetables, as well as the drying of agricultural byproducts like tea, herbal medicine, flowers and feed. The drying even involves chemical products, building industry, food processing and daily life. Traditional drying refers to natural drying agricultural products. Then, through further development of solar technology, we take solar energy as the auxiliary heat source for drying. Now, due to the development of solar gathering technology, single solar energy can meet the drying of agricultural products. Especially, the development of heat storage technology in recent years can reduce the adverse influence on the drying operation by weather and season to lay a foundation for better utilization of solar energy.