The research of solar drying technology in China is later than that in the developed countries. Before the 1980s, China only has 4 solar drying devices, with the total day lighting area of only 183 m2. But after the 1980s, the greenhouse-type solar dryer developed faster. Because of simple structure and cheap cost, this kind of dryer developed very quickly in Shanxi, Hebei, Henan, Beijing and Guangdong. There were more than 70 solar drying devices, with total day lighting area of 5,000 m2. However, this dryer entered in an off-peak period in the 1990s and was basically in a stagnant status.