Caodian town, the hometown of Chinese mushroom, is located in the north of suxian county, hubei province, at the southern foot of tongbo mountain and the upper reaches of huaihe river basin. Convenient transportation and beautiful environment. Rich in resources, rich in mushroom, gastrodia elata, black fungus, chestnut, Chinese medicine, etc., good quality. Caodian town has been awarded the titles of "science and technology demonstration town of national new rural construction", "hometown of Chinese mushroom" and "national standardized production base of ten thousand tons of edible fungi". The edible mushroom industry is the pillar industry of caodian town. Due to the unique climate of the region, the lentinus edodes produced in caodian town taste smooth and have excellent quality. The daily trading volume of lentinus edodes market reaches more than 100,000 kg, which enjoys a good reputation both at home and abroad and has become a place where merchants gather.