Dongzhi county is one of the four bases of auricularia auricula in China. In 22 years, it obtained geographical indications of agricultural products, with a planting area of 9 hectares and an annual output of 654.38+0.35 million tons. In the east, dried auricularia auricula is horny, brown on the front, gray on the back, solitary in spike shape and clear in ear marks. After foaming, the surface of each flower is black and shiny, and the back of each flower is slightly gray.